{"id":526,"date":"2026-08-17T20:47:15","date_gmt":"2026-08-17T20:47:15","guid":{"rendered":"https:\/\/medatlashealth.com\/?p=526"},"modified":"2026-09-18T17:27:00","modified_gmt":"2026-09-18T17:27:00","slug":"how-blood-circulates-through-your-body","status":"publish","type":"post","link":"https:\/\/medatlashealth.com\/rs\/how-blood-circulates-through-your-body\/","title":{"rendered":"How Blood Circulates Through Your Body:                   The Journey of a Red Blood Cell"},"content":{"rendered":"<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-4fc3f8e1 wp-block-group-is-layout-flex\">\n<p class=\"has-text-align-left wp-block-paragraph\">Every second of your life, trillions of red blood cells are traveling through an extraordinary network of blood vessels.<\/p>\n\n\n\n<p class=\"has-text-align-left wp-block-paragraph\">They move through your heart, rush toward your lungs, collect oxygen, travel through arteries, squeeze through microscopic capillaries and eventually return to the heart to begin the journey again.<\/p>\n\n\n\n<p class=\"has-text-align-left wp-block-paragraph\" style=\"padding-top:0;padding-right:0;padding-bottom:0;padding-left:0\">You never feel this enormous transportation system working \u2014 yet nearly every cell in your body depends on it.<\/p>\n\n\n\n<p class=\"has-text-align-left wp-block-paragraph\">So what actually happens to a red blood cell as it travels through your body?<\/p>\n\n\n\n<p class=\"has-text-align-left wp-block-paragraph\">Let\u2019s follow one.<\/p>\n<\/div>\n\n\n<style>.kb-table-of-content-nav.kb-table-of-content-id526_156074-1d .kb-table-of-content-wrap{padding-top:var(--global-kb-spacing-sm, 1.5rem);padding-right:var(--global-kb-spacing-sm, 1.5rem);padding-bottom:var(--global-kb-spacing-sm, 1.5rem);padding-left:var(--global-kb-spacing-sm, 1.5rem);background-color:#dbe7f5;border-top:1px solid var(--global-palette1, #3182CE);border-right:1px solid var(--global-palette1, #3182CE);border-bottom:1px solid var(--global-palette1, #3182CE);border-left:1px solid var(--global-palette1, #3182CE);border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-right-radius:18px;border-bottom-left-radius:18px;}.kb-table-of-content-nav.kb-table-of-content-id526_156074-1d .kb-table-of-contents-title-wrap{padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.kb-table-of-content-nav.kb-table-of-content-id526_156074-1d .kb-table-of-contents-title-wrap{color:#245fb8;}.kb-table-of-content-nav.kb-table-of-content-id526_156074-1d .kb-table-of-contents-title{color:#245fb8;font-size:20px;font-weight:regular;font-style:normal;}.kb-table-of-content-nav.kb-table-of-content-id526_156074-1d .kb-table-of-content-wrap .kb-table-of-content-list{font-weight:regular;font-style:normal;margin-top:var(--global-kb-spacing-sm, 1.5rem);margin-right:0px;margin-bottom:0px;margin-left:0px;}.kb-table-of-content-nav.kb-table-of-content-id526_156074-1d .kb-toggle-icon-style-basiccircle .kb-table-of-contents-icon-trigger:after, .kb-table-of-content-nav.kb-table-of-content-id526_156074-1d .kb-toggle-icon-style-basiccircle .kb-table-of-contents-icon-trigger:before, .kb-table-of-content-nav.kb-table-of-content-id526_156074-1d .kb-toggle-icon-style-arrowcircle .kb-table-of-contents-icon-trigger:after, .kb-table-of-content-nav.kb-table-of-content-id526_156074-1d .kb-toggle-icon-style-arrowcircle .kb-table-of-contents-icon-trigger:before, .kb-table-of-content-nav.kb-table-of-content-id526_156074-1d .kb-toggle-icon-style-xclosecircle .kb-table-of-contents-icon-trigger:after, .kb-table-of-content-nav.kb-table-of-content-id526_156074-1d .kb-toggle-icon-style-xclosecircle .kb-table-of-contents-icon-trigger:before{background-color:#dbe7f5;}@media all and (max-width: 1024px){.kb-table-of-content-nav.kb-table-of-content-id526_156074-1d .kb-table-of-content-wrap{border-top:1px solid var(--global-palette1, #3182CE);border-right:1px solid var(--global-palette1, #3182CE);border-bottom:1px solid var(--global-palette1, #3182CE);border-left:1px solid var(--global-palette1, #3182CE);}}@media all and (max-width: 767px){.kb-table-of-content-nav.kb-table-of-content-id526_156074-1d .kb-table-of-content-wrap{border-top:1px solid var(--global-palette1, #3182CE);border-right:1px solid var(--global-palette1, #3182CE);border-bottom:1px solid var(--global-palette1, #3182CE);border-left:1px solid var(--global-palette1, #3182CE);}}<\/style>\n\n\n<div class=\"wp-block-group medatlas-h2 has-border-color has-background is-content-justification-center is-nowrap is-layout-flex wp-container-core-group-is-layout-930d7113 wp-block-group-is-layout-flex\" style=\"border-color:#cedff2;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;background-color:#f4f9ff;padding-top:12px;padding-right:12px;padding-bottom:12px;padding-left:12px\"><style>.kt-svg-icons526_675896-4f .kt-svg-item-0 .kb-svg-icon-wrap{color:var(--global-palette4, #2D3748);font-size:50px;}.wp-block-kadence-icon.kt-svg-icons526_675896-4f{justify-content:center;}<\/style>\n<div class=\"wp-block-kadence-icon kt-svg-icons kt-svg-icons526_675896-4f alignnone\"><style>.kt-svg-item-526_40fb5d-80 .kb-svg-icon-wrap, .kt-svg-style-stacked.kt-svg-item-526_40fb5d-80 .kb-svg-icon-wrap{color:#f31a1a;font-size:40px;}<\/style>\n<div class=\"wp-block-kadence-single-icon kt-svg-style-default kt-svg-icon-wrap kt-svg-item-526_40fb5d-80\"><span class=\"kb-svg-icon-wrap kb-svg-icon-ic_droplet\"><svg viewbox=\"0 0 8 8\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M3 0l-.34.34c-.11.11-2.66 2.69-2.66 4.88 0 1.65 1.35 3 3 3s3-1.35 3-3c0-2.18-2.55-4.77-2.66-4.88l-.34-.34zm-1.5 4.72c.28 0 .5.22.5.5 0 .55.45 1 1 1 .28 0 .5.22.5.5s-.22.5-.5.5c-1.1 0-2-.9-2-2 0-.28.22-.5.5-.5z\" transform=\"translate(1)\"\/><\/svg><\/span><\/div>\n\n\n<style>.kt-svg-item-526_821549-b4 .kb-svg-icon-wrap, .kt-svg-style-stacked.kt-svg-item-526_821549-b4 .kb-svg-icon-wrap{color:#1167d8;font-size:40px;}<\/style>\n<div class=\"wp-block-kadence-single-icon kt-svg-style-default kt-svg-icon-wrap kt-svg-item-526_821549-b4\"><span class=\"kb-svg-icon-wrap kb-svg-icon-ic_circular\"><svg viewbox=\"0 0 8 8\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M4 0c-1.65 0-3 1.35-3 3h-1l1.5 2 1.5-2h-1c0-1.11.89-2 2-2v-1zm2.5 1l-1.5 2h1c0 1.11-.89 2-2 2v1c1.65 0 3-1.35 3-3h1l-1.5-2z\" transform=\"translate(0 1)\"\/><\/svg><\/span><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-center has-text-color has-link-color wp-elements-1\" style=\"border-top-left-radius:190px;border-top-right-radius:190px;border-bottom-left-radius:190px;border-bottom-right-radius:190px;color:#245fb8\">Meet the Red Blood Cell<\/h2>\n<\/div>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p class=\"wp-block-paragraph\">Red blood cells, also called <strong>erythrocytes<\/strong>, are specialized blood cells whose primary role is transporting oxygen from the lungs to tissues throughout the body.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Their distinctive <strong>biconcave shape<\/strong> \u2014 thinner in the center and thicker around the edges \u2014 provides a large surface area for gas exchange and helps them remain flexible enough to pass through extremely narrow capillaries.<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"683\" data-id=\"527\" src=\"https:\/\/medatlashealth.com\/wp-content\/uploads\/2026\/08\/Red-cells-1024x683.png\" alt=\"\" class=\"wp-image-527\" srcset=\"https:\/\/medatlashealth.com\/wp-content\/uploads\/2026\/08\/Red-cells-1024x683.png 1024w, https:\/\/medatlashealth.com\/wp-content\/uploads\/2026\/08\/Red-cells-300x200.png 300w, https:\/\/medatlashealth.com\/wp-content\/uploads\/2026\/08\/Red-cells-768x512.png 768w, https:\/\/medatlashealth.com\/wp-content\/uploads\/2026\/08\/Red-cells.png 1536w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Inside each red blood cell are millions of molecules of <strong>hemoglobin<\/strong>, an iron-containing protein capable of binding oxygen.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This makes a red blood cell something like a microscopic oxygen transport vehicle.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But our journey begins after much of that oxygen has already been delivered.<\/p>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group medatlas-h2 has-border-color has-background is-content-justification-center is-nowrap is-layout-flex wp-container-core-group-is-layout-930d7113 wp-block-group-is-layout-flex\" style=\"border-color:#cedff2;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;background-color:#f4f9ff;padding-top:12px;padding-right:12px;padding-bottom:12px;padding-left:12px\"><style>.kt-svg-icons526_cb4090-7c .kt-svg-item-0 .kb-svg-icon-wrap{color:var(--global-palette4, #2D3748);font-size:50px;}.wp-block-kadence-icon.kt-svg-icons526_cb4090-7c{justify-content:center;}<\/style>\n<div class=\"wp-block-kadence-icon kt-svg-icons kt-svg-icons526_cb4090-7c alignnone\"><style>.kt-svg-item-526_7f94d0-a7 .kb-svg-icon-wrap, .kt-svg-style-stacked.kt-svg-item-526_7f94d0-a7 .kb-svg-icon-wrap{color:#f31a1a;font-size:40px;}<\/style>\n<div class=\"wp-block-kadence-single-icon kt-svg-style-default kt-svg-icon-wrap kt-svg-item-526_7f94d0-a7\"><span class=\"kb-svg-icon-wrap kb-svg-icon-ic_droplet\"><svg viewbox=\"0 0 8 8\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M3 0l-.34.34c-.11.11-2.66 2.69-2.66 4.88 0 1.65 1.35 3 3 3s3-1.35 3-3c0-2.18-2.55-4.77-2.66-4.88l-.34-.34zm-1.5 4.72c.28 0 .5.22.5.5 0 .55.45 1 1 1 .28 0 .5.22.5.5s-.22.5-.5.5c-1.1 0-2-.9-2-2 0-.28.22-.5.5-.5z\" transform=\"translate(1)\"\/><\/svg><\/span><\/div>\n\n\n<style>.kt-svg-item-526_6d49d5-56 .kb-svg-icon-wrap, .kt-svg-style-stacked.kt-svg-item-526_6d49d5-56 .kb-svg-icon-wrap{color:#1167d8;font-size:40px;}<\/style>\n<div class=\"wp-block-kadence-single-icon kt-svg-style-default kt-svg-icon-wrap kt-svg-item-526_6d49d5-56\"><span class=\"kb-svg-icon-wrap kb-svg-icon-ic_circular\"><svg viewbox=\"0 0 8 8\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M4 0c-1.65 0-3 1.35-3 3h-1l1.5 2 1.5-2h-1c0-1.11.89-2 2-2v-1zm2.5 1l-1.5 2h1c0 1.11-.89 2-2 2v1c1.65 0 3-1.35 3-3h1l-1.5-2z\" transform=\"translate(0 1)\"\/><\/svg><\/span><\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center has-text-color has-link-color wp-elements-2\" style=\"border-top-left-radius:225px;border-top-right-radius:225px;border-bottom-left-radius:225px;border-bottom-right-radius:225px;color:#245fb8\">Step 1: Returning From the Body<\/h3>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-4fc3f8e1 wp-block-group-is-layout-flex\">\n<p class=\"wp-block-paragraph\">Imagine our red blood cell has just traveled through the tissues of your leg.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It has delivered much of its oxygen to cells that need it for metabolism. At the same time, carbon dioxide produced by those cells enters the blood and is transported toward the lungs for removal.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The blood is now relatively <strong>oxygen-poor<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Small veins gradually merge into increasingly larger veins as blood moves toward the heart.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Eventually, blood from the lower part of the body reaches a huge vein called the &#8211; <strong>vena cava inferior<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Blood returning from the head, neck, arms and upper chest arrives through another large vessel \u2014 the<strong> vena cava<\/strong> <strong>superior<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Both empty into the same destination:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Our red blood cell has reached the heart &#8211; The right atrium<strong>.<\/strong><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group medatlas-h2 has-border-color has-background is-content-justification-center is-nowrap is-layout-flex wp-container-core-group-is-layout-930d7113 wp-block-group-is-layout-flex\" style=\"border-color:#cedff2;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;background-color:#f4f9ff;padding-top:12px;padding-right:12px;padding-bottom:12px;padding-left:12px\"><style>.kt-svg-icons526_9ef514-da .kt-svg-item-0 .kb-svg-icon-wrap{color:var(--global-palette4, #2D3748);font-size:50px;}.wp-block-kadence-icon.kt-svg-icons526_9ef514-da{justify-content:center;}<\/style>\n<div class=\"wp-block-kadence-icon kt-svg-icons kt-svg-icons526_9ef514-da alignnone\"><style>.kt-svg-item-526_9a4d2f-96 .kb-svg-icon-wrap, .kt-svg-style-stacked.kt-svg-item-526_9a4d2f-96 .kb-svg-icon-wrap{color:#f31a1a;font-size:40px;}<\/style>\n<div class=\"wp-block-kadence-single-icon kt-svg-style-default kt-svg-icon-wrap kt-svg-item-526_9a4d2f-96\"><span class=\"kb-svg-icon-wrap kb-svg-icon-ic_droplet\"><svg viewbox=\"0 0 8 8\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M3 0l-.34.34c-.11.11-2.66 2.69-2.66 4.88 0 1.65 1.35 3 3 3s3-1.35 3-3c0-2.18-2.55-4.77-2.66-4.88l-.34-.34zm-1.5 4.72c.28 0 .5.22.5.5 0 .55.45 1 1 1 .28 0 .5.22.5.5s-.22.5-.5.5c-1.1 0-2-.9-2-2 0-.28.22-.5.5-.5z\" transform=\"translate(1)\"\/><\/svg><\/span><\/div>\n\n\n<style>.kt-svg-item-526_43ff47-a6 .kb-svg-icon-wrap, .kt-svg-style-stacked.kt-svg-item-526_43ff47-a6 .kb-svg-icon-wrap{color:#1167d8;font-size:40px;}<\/style>\n<div class=\"wp-block-kadence-single-icon kt-svg-style-default kt-svg-icon-wrap kt-svg-item-526_43ff47-a6\"><span class=\"kb-svg-icon-wrap kb-svg-icon-ic_circular\"><svg viewbox=\"0 0 8 8\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M4 0c-1.65 0-3 1.35-3 3h-1l1.5 2 1.5-2h-1c0-1.11.89-2 2-2v-1zm2.5 1l-1.5 2h1c0 1.11-.89 2-2 2v1c1.65 0 3-1.35 3-3h1l-1.5-2z\" transform=\"translate(0 1)\"\/><\/svg><\/span><\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center has-text-color has-link-color wp-elements-3\" style=\"border-top-left-radius:190px;border-top-right-radius:190px;border-bottom-left-radius:190px;border-bottom-right-radius:190px;color:#245fb8\">Step 2: Entering the Right Side of the Heart<\/h3>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-4fc3f8e1 wp-block-group-is-layout-flex\">\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-4fc3f8e1 wp-block-group-is-layout-flex\">\n<div class=\"wp-block-group has-border-color has-background\" style=\"border-color:#cedff2;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;background-color:#f4f9ff;padding-top:12px;padding-right:12px;padding-bottom:12px;padding-left:12px\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-container-core-group-is-layout-71739e78 wp-block-group-is-layout-constrained\">\n<p class=\"wp-block-paragraph\">The heart contains four chambers:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Right atrium<\/li>\n\n\n\n<li>Right ventricle<\/li>\n\n\n\n<li>Left atrium<\/li>\n\n\n\n<li>Left ventricle<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">The right side primarily receives oxygen-poor blood returning from the body and sends it toward the lungs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Our red blood cell first enters the <strong>right atrium<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">From there, it passes through the <strong>tricuspid valve<\/strong> and enters the <strong>right ventricle<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Heart valves act as one-way gates. Their coordinated opening and closing helps keep blood moving in the correct direction.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When the right ventricle contracts, pressure rises.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The tricuspid valve closes behind the blood, while the <strong>pulmonary valve<\/strong> opens ahead.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Our red blood cell is pushed out of the heart.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Its next destination is the lungs.<\/p>\n<\/div>\n<\/div>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/medatlashealth.com\/wp-content\/uploads\/2026\/08\/structure-of-heart-1024x683.png\" alt=\"\" class=\"wp-image-530\" style=\"aspect-ratio:1.499310034979622;width:703px;height:auto\" srcset=\"https:\/\/medatlashealth.com\/wp-content\/uploads\/2026\/08\/structure-of-heart-1024x683.png 1024w, https:\/\/medatlashealth.com\/wp-content\/uploads\/2026\/08\/structure-of-heart-300x200.png 300w, https:\/\/medatlashealth.com\/wp-content\/uploads\/2026\/08\/structure-of-heart-768x512.png 768w, https:\/\/medatlashealth.com\/wp-content\/uploads\/2026\/08\/structure-of-heart.png 1536w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<div class=\"wp-block-group medatlas-h2 has-border-color has-background is-content-justification-center is-nowrap is-layout-flex wp-container-core-group-is-layout-930d7113 wp-block-group-is-layout-flex\" style=\"border-color:#cedff2;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;background-color:#f4f9ff;padding-top:12px;padding-right:12px;padding-bottom:12px;padding-left:12px\"><style>.kt-svg-icons526_a4181c-c9 .kt-svg-item-0 .kb-svg-icon-wrap{color:var(--global-palette4, #2D3748);font-size:50px;}.wp-block-kadence-icon.kt-svg-icons526_a4181c-c9{justify-content:center;}<\/style>\n<div class=\"wp-block-kadence-icon kt-svg-icons kt-svg-icons526_a4181c-c9 alignnone\"><style>.kt-svg-item-526_260b7c-92 .kb-svg-icon-wrap, .kt-svg-style-stacked.kt-svg-item-526_260b7c-92 .kb-svg-icon-wrap{color:#f31a1a;font-size:40px;}<\/style>\n<div class=\"wp-block-kadence-single-icon kt-svg-style-default kt-svg-icon-wrap kt-svg-item-526_260b7c-92\"><span class=\"kb-svg-icon-wrap kb-svg-icon-ic_droplet\"><svg viewbox=\"0 0 8 8\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M3 0l-.34.34c-.11.11-2.66 2.69-2.66 4.88 0 1.65 1.35 3 3 3s3-1.35 3-3c0-2.18-2.55-4.77-2.66-4.88l-.34-.34zm-1.5 4.72c.28 0 .5.22.5.5 0 .55.45 1 1 1 .28 0 .5.22.5.5s-.22.5-.5.5c-1.1 0-2-.9-2-2 0-.28.22-.5.5-.5z\" transform=\"translate(1)\"\/><\/svg><\/span><\/div>\n\n\n<style>.kt-svg-item-526_aedea5-f0 .kb-svg-icon-wrap, .kt-svg-style-stacked.kt-svg-item-526_aedea5-f0 .kb-svg-icon-wrap{color:#1167d8;font-size:40px;}<\/style>\n<div class=\"wp-block-kadence-single-icon kt-svg-style-default kt-svg-icon-wrap kt-svg-item-526_aedea5-f0\"><span class=\"kb-svg-icon-wrap kb-svg-icon-ic_circular\"><svg viewbox=\"0 0 8 8\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M4 0c-1.65 0-3 1.35-3 3h-1l1.5 2 1.5-2h-1c0-1.11.89-2 2-2v-1zm2.5 1l-1.5 2h1c0 1.11-.89 2-2 2v1c1.65 0 3-1.35 3-3h1l-1.5-2z\" transform=\"translate(0 1)\"\/><\/svg><\/span><\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center has-text-color has-link-color wp-elements-4\" style=\"border-top-left-radius:209px;border-top-right-radius:209px;border-bottom-left-radius:209px;border-bottom-right-radius:209px;color:#245fb8\">Step 3: Traveling Through the Pulmonary Arteries<\/h3>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-4fc3f8e1 wp-block-group-is-layout-flex\">\n<p class=\"wp-block-paragraph\">After leaving the right ventricle, blood enters the <strong>pulmonary trunk<\/strong>, which divides into the right and left pulmonary arteries.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here we encounter an important exception to a common rule.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Arteries are often described as vessels carrying oxygen-rich blood, but that definition isn&#8217;t completely accurate.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">An artery is actually defined by the <strong>direction of blood flow<\/strong>: arteries carry blood <strong>away from the heart<\/strong>. The pulmonary arteries therefore carry oxygen-poor blood away from the heart and toward the lungs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">As our red blood cell travels deeper into the lungs, the pulmonary arteries divide repeatedly into smaller vessels.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Eventually, it reaches a network of tiny pulmonary capillaries surrounding the lungs&#8217; microscopic air sacs \u2014 the <strong>alveole<\/strong>.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group medatlas-h2 has-border-color has-background is-content-justification-center is-nowrap is-layout-flex wp-container-core-group-is-layout-930d7113 wp-block-group-is-layout-flex\" style=\"border-color:#cedff2;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;background-color:#f4f9ff;padding-top:12px;padding-right:12px;padding-bottom:12px;padding-left:12px\"><style>.kt-svg-icons526_ca69bc-d9 .kt-svg-item-0 .kb-svg-icon-wrap{color:var(--global-palette4, #2D3748);font-size:50px;}.wp-block-kadence-icon.kt-svg-icons526_ca69bc-d9{justify-content:center;}<\/style>\n<div class=\"wp-block-kadence-icon kt-svg-icons kt-svg-icons526_ca69bc-d9 alignnone\"><style>.kt-svg-item-526_dc8952-7c .kb-svg-icon-wrap, .kt-svg-style-stacked.kt-svg-item-526_dc8952-7c .kb-svg-icon-wrap{color:#f31a1a;font-size:40px;}<\/style>\n<div class=\"wp-block-kadence-single-icon kt-svg-style-default kt-svg-icon-wrap kt-svg-item-526_dc8952-7c\"><span class=\"kb-svg-icon-wrap kb-svg-icon-ic_droplet\"><svg viewbox=\"0 0 8 8\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M3 0l-.34.34c-.11.11-2.66 2.69-2.66 4.88 0 1.65 1.35 3 3 3s3-1.35 3-3c0-2.18-2.55-4.77-2.66-4.88l-.34-.34zm-1.5 4.72c.28 0 .5.22.5.5 0 .55.45 1 1 1 .28 0 .5.22.5.5s-.22.5-.5.5c-1.1 0-2-.9-2-2 0-.28.22-.5.5-.5z\" transform=\"translate(1)\"\/><\/svg><\/span><\/div>\n\n\n<style>.kt-svg-item-526_53f5ce-61 .kb-svg-icon-wrap, .kt-svg-style-stacked.kt-svg-item-526_53f5ce-61 .kb-svg-icon-wrap{color:#1167d8;font-size:40px;}<\/style>\n<div class=\"wp-block-kadence-single-icon kt-svg-style-default kt-svg-icon-wrap kt-svg-item-526_53f5ce-61\"><span class=\"kb-svg-icon-wrap kb-svg-icon-ic_circular\"><svg viewbox=\"0 0 8 8\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M4 0c-1.65 0-3 1.35-3 3h-1l1.5 2 1.5-2h-1c0-1.11.89-2 2-2v-1zm2.5 1l-1.5 2h1c0 1.11-.89 2-2 2v1c1.65 0 3-1.35 3-3h1l-1.5-2z\" transform=\"translate(0 1)\"\/><\/svg><\/span><\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center medatlas-h2 has-text-color has-link-color wp-elements-5\" style=\"border-top-left-radius:225px;border-top-right-radius:225px;border-bottom-left-radius:225px;border-bottom-right-radius:225px;color:#245fb8\">Step 4: Picking Up Oxygen in the Lungs<\/h3>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-4fc3f8e1 wp-block-group-is-layout-flex\">\n<p class=\"wp-block-paragraph\">The walls separating air inside the alveoli from blood inside pulmonary capillaries are extremely thin.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This allows gases to move between the lungs and bloodstream.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Oxygen from inhaled air crosses into the blood and binds to <strong>hemoglobin inside red blood cells<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At the same time, carbon dioxide moves in the opposite direction \u2014 from the blood toward the alveoli \u2014 so it can eventually leave the body when you exhale.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Our red blood cell is now carrying a fresh supply of oxygen.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It is ready to return to the heart.<\/p>\n<\/div>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/medatlashealth.com\/wp-content\/uploads\/2026\/08\/Oxygen-picking-up-1024x683.png\" alt=\"\" class=\"wp-image-531\" srcset=\"https:\/\/medatlashealth.com\/wp-content\/uploads\/2026\/08\/Oxygen-picking-up-1024x683.png 1024w, https:\/\/medatlashealth.com\/wp-content\/uploads\/2026\/08\/Oxygen-picking-up-300x200.png 300w, https:\/\/medatlashealth.com\/wp-content\/uploads\/2026\/08\/Oxygen-picking-up-768x512.png 768w, https:\/\/medatlashealth.com\/wp-content\/uploads\/2026\/08\/Oxygen-picking-up.png 1536w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<div class=\"wp-block-group medatlas-h2 has-border-color has-background is-content-justification-center is-nowrap is-layout-flex wp-container-core-group-is-layout-930d7113 wp-block-group-is-layout-flex\" style=\"border-color:#cedff2;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;background-color:#f4f9ff;padding-top:12px;padding-right:12px;padding-bottom:12px;padding-left:12px\"><style>.kt-svg-icons526_79d2dd-18 .kt-svg-item-0 .kb-svg-icon-wrap{color:var(--global-palette4, #2D3748);font-size:50px;}.wp-block-kadence-icon.kt-svg-icons526_79d2dd-18{justify-content:center;}<\/style>\n<div class=\"wp-block-kadence-icon kt-svg-icons kt-svg-icons526_79d2dd-18 alignnone\"><style>.kt-svg-item-526_3412dd-53 .kb-svg-icon-wrap, .kt-svg-style-stacked.kt-svg-item-526_3412dd-53 .kb-svg-icon-wrap{color:#f31a1a;font-size:40px;}<\/style>\n<div class=\"wp-block-kadence-single-icon kt-svg-style-default kt-svg-icon-wrap kt-svg-item-526_3412dd-53\"><span class=\"kb-svg-icon-wrap kb-svg-icon-ic_droplet\"><svg viewbox=\"0 0 8 8\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M3 0l-.34.34c-.11.11-2.66 2.69-2.66 4.88 0 1.65 1.35 3 3 3s3-1.35 3-3c0-2.18-2.55-4.77-2.66-4.88l-.34-.34zm-1.5 4.72c.28 0 .5.22.5.5 0 .55.45 1 1 1 .28 0 .5.22.5.5s-.22.5-.5.5c-1.1 0-2-.9-2-2 0-.28.22-.5.5-.5z\" transform=\"translate(1)\"\/><\/svg><\/span><\/div>\n\n\n<style>.kt-svg-item-526_7a94ad-ca .kb-svg-icon-wrap, .kt-svg-style-stacked.kt-svg-item-526_7a94ad-ca .kb-svg-icon-wrap{color:#1167d8;font-size:40px;}<\/style>\n<div class=\"wp-block-kadence-single-icon kt-svg-style-default kt-svg-icon-wrap kt-svg-item-526_7a94ad-ca\"><span class=\"kb-svg-icon-wrap kb-svg-icon-ic_circular\"><svg viewbox=\"0 0 8 8\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M4 0c-1.65 0-3 1.35-3 3h-1l1.5 2 1.5-2h-1c0-1.11.89-2 2-2v-1zm2.5 1l-1.5 2h1c0 1.11-.89 2-2 2v1c1.65 0 3-1.35 3-3h1l-1.5-2z\" transform=\"translate(0 1)\"\/><\/svg><\/span><\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center has-text-color has-link-color wp-elements-6\" style=\"border-top-left-radius:177px;border-top-right-radius:177px;border-bottom-left-radius:177px;border-bottom-right-radius:177px;color:#245fb8\">Step 5: Returning to the Left Side of the Heart<\/h3>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-4fc3f8e1 wp-block-group-is-layout-flex\">\n<p class=\"wp-block-paragraph\">Oxygen-rich blood leaves the lungs through the <strong>pulmonary veins<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">These vessels provide another useful exception to remember.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Most veins carry oxygen-poor blood, but pulmonary veins carry <strong>oxygen-rich blood<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Again, what defines a vein is not oxygen content.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Veins are vessels that carry blood <strong>toward the heart<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The pulmonary veins deliver our red blood cell into the <strong>left atrium<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">From there, it passes through the <strong>mitral valve<\/strong> and enters the left ventricle.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">And now it has arrived at the most powerful pumping chamber of the heart.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group medatlas-h2 has-border-color has-background is-content-justification-center is-nowrap is-layout-flex wp-container-core-group-is-layout-930d7113 wp-block-group-is-layout-flex\" style=\"border-color:#cedff2;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;background-color:#f4f9ff;padding-top:12px;padding-right:12px;padding-bottom:12px;padding-left:12px\"><style>.kt-svg-icons526_a1fd2c-b9 .kt-svg-item-0 .kb-svg-icon-wrap{color:var(--global-palette4, #2D3748);font-size:50px;}.wp-block-kadence-icon.kt-svg-icons526_a1fd2c-b9{justify-content:center;}<\/style>\n<div class=\"wp-block-kadence-icon kt-svg-icons kt-svg-icons526_a1fd2c-b9 alignnone\"><style>.kt-svg-item-526_1b9dec-5e .kb-svg-icon-wrap, .kt-svg-style-stacked.kt-svg-item-526_1b9dec-5e .kb-svg-icon-wrap{color:#f31a1a;font-size:40px;}<\/style>\n<div class=\"wp-block-kadence-single-icon kt-svg-style-default kt-svg-icon-wrap kt-svg-item-526_1b9dec-5e\"><span class=\"kb-svg-icon-wrap kb-svg-icon-ic_droplet\"><svg viewbox=\"0 0 8 8\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M3 0l-.34.34c-.11.11-2.66 2.69-2.66 4.88 0 1.65 1.35 3 3 3s3-1.35 3-3c0-2.18-2.55-4.77-2.66-4.88l-.34-.34zm-1.5 4.72c.28 0 .5.22.5.5 0 .55.45 1 1 1 .28 0 .5.22.5.5s-.22.5-.5.5c-1.1 0-2-.9-2-2 0-.28.22-.5.5-.5z\" transform=\"translate(1)\"\/><\/svg><\/span><\/div>\n\n\n<style>.kt-svg-item-526_814c60-7a .kb-svg-icon-wrap, .kt-svg-style-stacked.kt-svg-item-526_814c60-7a .kb-svg-icon-wrap{color:#1167d8;font-size:40px;}<\/style>\n<div class=\"wp-block-kadence-single-icon kt-svg-style-default kt-svg-icon-wrap kt-svg-item-526_814c60-7a\"><span class=\"kb-svg-icon-wrap kb-svg-icon-ic_circular\"><svg viewbox=\"0 0 8 8\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M4 0c-1.65 0-3 1.35-3 3h-1l1.5 2 1.5-2h-1c0-1.11.89-2 2-2v-1zm2.5 1l-1.5 2h1c0 1.11-.89 2-2 2v1c1.65 0 3-1.35 3-3h1l-1.5-2z\" transform=\"translate(0 1)\"\/><\/svg><\/span><\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center has-text-color has-link-color wp-elements-7\" style=\"border-top-left-radius:222px;border-top-right-radius:222px;border-bottom-left-radius:222px;border-bottom-right-radius:222px;color:#245fb8\">Step 6: The Left Ventricle \u2014 Preparing for the Big Journey<\/h3>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-4fc3f8e1 wp-block-group-is-layout-flex\">\n<p class=\"wp-block-paragraph\">The <strong>left ventricle<\/strong> has a particularly thick muscular wall because it must generate enough pressure to send blood through the systemic circulation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When it contracts, the mitral valve closes and the <strong>aortic valve<\/strong> opens.<\/p>\n\n\n\n<div class=\"wp-block-group has-border-color has-background\" style=\"border-color:#cedff2;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;background-color:#f4f9ff;padding-top:5px;padding-right:5px;padding-bottom:5px;padding-left:5px\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-container-core-group-is-layout-2679e2a0 wp-block-group-is-layout-constrained\">\n<p class=\"has-text-align-center wp-block-paragraph\">Our oxygen-loaded red blood cell is propelled through the valve and into the largest artery in the body: <strong>THE AORTA<\/strong><\/p>\n<\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">From here, blood can reach almost every region of the body.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The journey through the systemic circulation has begun.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group medatlas-h2 has-border-color has-background is-content-justification-center is-nowrap is-layout-flex wp-container-core-group-is-layout-930d7113 wp-block-group-is-layout-flex\" style=\"border-color:#cedff2;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;background-color:#f4f9ff;padding-top:12px;padding-right:12px;padding-bottom:12px;padding-left:12px\"><style>.kt-svg-icons526_4b8987-bc .kt-svg-item-0 .kb-svg-icon-wrap{color:var(--global-palette4, #2D3748);font-size:50px;}.wp-block-kadence-icon.kt-svg-icons526_4b8987-bc{justify-content:center;}<\/style>\n<div class=\"wp-block-kadence-icon kt-svg-icons kt-svg-icons526_4b8987-bc alignnone\"><style>.kt-svg-item-526_95ef1e-7e .kb-svg-icon-wrap, .kt-svg-style-stacked.kt-svg-item-526_95ef1e-7e .kb-svg-icon-wrap{color:#f31a1a;font-size:40px;}<\/style>\n<div class=\"wp-block-kadence-single-icon kt-svg-style-default kt-svg-icon-wrap kt-svg-item-526_95ef1e-7e\"><span class=\"kb-svg-icon-wrap kb-svg-icon-ic_droplet\"><svg viewbox=\"0 0 8 8\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M3 0l-.34.34c-.11.11-2.66 2.69-2.66 4.88 0 1.65 1.35 3 3 3s3-1.35 3-3c0-2.18-2.55-4.77-2.66-4.88l-.34-.34zm-1.5 4.72c.28 0 .5.22.5.5 0 .55.45 1 1 1 .28 0 .5.22.5.5s-.22.5-.5.5c-1.1 0-2-.9-2-2 0-.28.22-.5.5-.5z\" transform=\"translate(1)\"\/><\/svg><\/span><\/div>\n\n\n<style>.kt-svg-item-526_296e86-bc .kb-svg-icon-wrap, .kt-svg-style-stacked.kt-svg-item-526_296e86-bc .kb-svg-icon-wrap{color:#1167d8;font-size:40px;}<\/style>\n<div class=\"wp-block-kadence-single-icon kt-svg-style-default kt-svg-icon-wrap kt-svg-item-526_296e86-bc\"><span class=\"kb-svg-icon-wrap kb-svg-icon-ic_circular\"><svg viewbox=\"0 0 8 8\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M4 0c-1.65 0-3 1.35-3 3h-1l1.5 2 1.5-2h-1c0-1.11.89-2 2-2v-1zm2.5 1l-1.5 2h1c0 1.11-.89 2-2 2v1c1.65 0 3-1.35 3-3h1l-1.5-2z\" transform=\"translate(0 1)\"\/><\/svg><\/span><\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center has-text-color has-link-color wp-elements-8\" style=\"border-top-left-radius:186px;border-top-right-radius:186px;border-bottom-left-radius:186px;border-bottom-right-radius:186px;color:#245fb8\">Step 7: From the Aorta to the Arteries<\/h3>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-4fc3f8e1 wp-block-group-is-layout-flex\">\n<p class=\"wp-block-paragraph\">Think of the circulatory system like an enormous branching transportation network.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The aorta is the main highway.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Large arteries branch from it and divide into progressively smaller arteries. Those vessels eventually become smaller <strong>arterioles<\/strong>, which lead toward networks of capillaries.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Different branches deliver blood to different organs and tissues.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Some travel toward the brain.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Others supply the kidneys, digestive organs, muscles and skin.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Even the heart needs its own blood supply. The <strong>coronary arteries<\/strong>, which arise near the beginning of the aorta, deliver oxygen-rich blood to the heart muscle itself.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Our red blood cell could travel down countless different routes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Suppose this time it enters an artery supplying a working muscle.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Soon, the large arterial highway becomes smaller and smaller.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Eventually, our red blood cell reaches the microscopic world of the capillaries.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group medatlas-h2 has-border-color has-background is-content-justification-center is-nowrap is-layout-flex wp-container-core-group-is-layout-930d7113 wp-block-group-is-layout-flex\" style=\"border-color:#cedff2;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;background-color:#f4f9ff;padding-top:12px;padding-right:12px;padding-bottom:12px;padding-left:12px\"><style>.kt-svg-icons526_5551f6-87 .kt-svg-item-0 .kb-svg-icon-wrap{color:var(--global-palette4, #2D3748);font-size:50px;}.wp-block-kadence-icon.kt-svg-icons526_5551f6-87{justify-content:center;}<\/style>\n<div class=\"wp-block-kadence-icon kt-svg-icons kt-svg-icons526_5551f6-87 alignnone\"><style>.kt-svg-item-526_f176ee-99 .kb-svg-icon-wrap, .kt-svg-style-stacked.kt-svg-item-526_f176ee-99 .kb-svg-icon-wrap{color:#f31a1a;font-size:40px;}<\/style>\n<div class=\"wp-block-kadence-single-icon kt-svg-style-default kt-svg-icon-wrap kt-svg-item-526_f176ee-99\"><span class=\"kb-svg-icon-wrap kb-svg-icon-ic_droplet\"><svg viewbox=\"0 0 8 8\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M3 0l-.34.34c-.11.11-2.66 2.69-2.66 4.88 0 1.65 1.35 3 3 3s3-1.35 3-3c0-2.18-2.55-4.77-2.66-4.88l-.34-.34zm-1.5 4.72c.28 0 .5.22.5.5 0 .55.45 1 1 1 .28 0 .5.22.5.5s-.22.5-.5.5c-1.1 0-2-.9-2-2 0-.28.22-.5.5-.5z\" transform=\"translate(1)\"\/><\/svg><\/span><\/div>\n\n\n<style>.kt-svg-item-526_52a615-ed .kb-svg-icon-wrap, .kt-svg-style-stacked.kt-svg-item-526_52a615-ed .kb-svg-icon-wrap{color:#1167d8;font-size:40px;}<\/style>\n<div class=\"wp-block-kadence-single-icon kt-svg-style-default kt-svg-icon-wrap kt-svg-item-526_52a615-ed\"><span class=\"kb-svg-icon-wrap kb-svg-icon-ic_circular\"><svg viewbox=\"0 0 8 8\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M4 0c-1.65 0-3 1.35-3 3h-1l1.5 2 1.5-2h-1c0-1.11.89-2 2-2v-1zm2.5 1l-1.5 2h1c0 1.11-.89 2-2 2v1c1.65 0 3-1.35 3-3h1l-1.5-2z\" transform=\"translate(0 1)\"\/><\/svg><\/span><\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center has-text-color has-link-color wp-elements-9\" style=\"border-top-left-radius:258px;border-top-right-radius:258px;border-bottom-left-radius:258px;border-bottom-right-radius:258px;color:#245fb8\">Step 8: Entering the Capillaries<\/h3>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-4fc3f8e1 wp-block-group-is-layout-flex\">\n<p class=\"wp-block-paragraph\">Capillaries are among the smallest blood vessels in the body.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Their walls are extremely thin, making them ideal locations for exchange between blood and surrounding tissues.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here, oxygen can move from the blood toward cells that need it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nutrients and other substances can also be exchanged, while metabolic waste products move from tissues toward the bloodstream.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The flexible shape of red blood cells allows them to deform as they move through tiny capillary passages.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is the destination for the oxygen our red blood cell collected in the lungs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Hemoglobin releases oxygen, which ultimately becomes available to surrounding tissues.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The red blood cell has completed its delivery.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But its journey is far from over.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group medatlas-h2 has-border-color has-background is-content-justification-center is-nowrap is-layout-flex wp-container-core-group-is-layout-930d7113 wp-block-group-is-layout-flex\" style=\"border-color:#cedff2;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;background-color:#f4f9ff;padding-top:12px;padding-right:12px;padding-bottom:12px;padding-left:12px\"><style>.kt-svg-icons526_f4ad26-69 .kt-svg-item-0 .kb-svg-icon-wrap{color:var(--global-palette4, #2D3748);font-size:50px;}.wp-block-kadence-icon.kt-svg-icons526_f4ad26-69{justify-content:center;}<\/style>\n<div class=\"wp-block-kadence-icon kt-svg-icons kt-svg-icons526_f4ad26-69 alignnone\"><style>.kt-svg-item-526_73048f-c5 .kb-svg-icon-wrap, .kt-svg-style-stacked.kt-svg-item-526_73048f-c5 .kb-svg-icon-wrap{color:#f31a1a;font-size:40px;}<\/style>\n<div class=\"wp-block-kadence-single-icon kt-svg-style-default kt-svg-icon-wrap kt-svg-item-526_73048f-c5\"><span class=\"kb-svg-icon-wrap kb-svg-icon-ic_droplet\"><svg viewbox=\"0 0 8 8\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M3 0l-.34.34c-.11.11-2.66 2.69-2.66 4.88 0 1.65 1.35 3 3 3s3-1.35 3-3c0-2.18-2.55-4.77-2.66-4.88l-.34-.34zm-1.5 4.72c.28 0 .5.22.5.5 0 .55.45 1 1 1 .28 0 .5.22.5.5s-.22.5-.5.5c-1.1 0-2-.9-2-2 0-.28.22-.5.5-.5z\" transform=\"translate(1)\"\/><\/svg><\/span><\/div>\n\n\n<style>.kt-svg-item-526_9549eb-54 .kb-svg-icon-wrap, .kt-svg-style-stacked.kt-svg-item-526_9549eb-54 .kb-svg-icon-wrap{color:#1167d8;font-size:40px;}<\/style>\n<div class=\"wp-block-kadence-single-icon kt-svg-style-default kt-svg-icon-wrap kt-svg-item-526_9549eb-54\"><span class=\"kb-svg-icon-wrap kb-svg-icon-ic_circular\"><svg viewbox=\"0 0 8 8\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M4 0c-1.65 0-3 1.35-3 3h-1l1.5 2 1.5-2h-1c0-1.11.89-2 2-2v-1zm2.5 1l-1.5 2h1c0 1.11-.89 2-2 2v1c1.65 0 3-1.35 3-3h1l-1.5-2z\" transform=\"translate(0 1)\"\/><\/svg><\/span><\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center has-text-color has-link-color wp-elements-10\" style=\"border-top-left-radius:294px;border-top-right-radius:294px;border-bottom-left-radius:294px;border-bottom-right-radius:294px;color:#245fb8\">Step 9: From Capillaries Into the Veins<\/h3>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-4fc3f8e1 wp-block-group-is-layout-flex\">\n<p class=\"wp-block-paragraph\">After passing through the capillary network, blood enters tiny vessels called <strong>venules<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Venules merge together to form progressively larger veins.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The pressure here is much lower than in the arteries.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In many parts of the body \u2014 particularly the legs \u2014 veins contain valves that help prevent blood from flowing backward. Skeletal muscle contractions also help move venous blood toward the heart.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Our red blood cell continues its return journey.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Eventually, it reaches either the superior or inferior vena cava.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ahead is the right atrium.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The entire cycle is about to begin again.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group medatlas-h2 has-border-color has-background is-content-justification-center is-nowrap is-layout-flex wp-container-core-group-is-layout-930d7113 wp-block-group-is-layout-flex\" style=\"border-color:#cedff2;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;background-color:#f4f9ff;padding-top:12px;padding-right:12px;padding-bottom:12px;padding-left:12px\"><style>.kt-svg-icons526_da0179-44 .kt-svg-item-0 .kb-svg-icon-wrap{color:var(--global-palette4, #2D3748);font-size:50px;}.wp-block-kadence-icon.kt-svg-icons526_da0179-44{justify-content:center;}<\/style>\n<div class=\"wp-block-kadence-icon kt-svg-icons kt-svg-icons526_da0179-44 alignnone\"><style>.kt-svg-item-526_c8ca92-fb .kb-svg-icon-wrap, .kt-svg-style-stacked.kt-svg-item-526_c8ca92-fb .kb-svg-icon-wrap{color:#f31a1a;font-size:40px;}<\/style>\n<div class=\"wp-block-kadence-single-icon kt-svg-style-default kt-svg-icon-wrap kt-svg-item-526_c8ca92-fb\"><span class=\"kb-svg-icon-wrap kb-svg-icon-ic_droplet\"><svg viewbox=\"0 0 8 8\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M3 0l-.34.34c-.11.11-2.66 2.69-2.66 4.88 0 1.65 1.35 3 3 3s3-1.35 3-3c0-2.18-2.55-4.77-2.66-4.88l-.34-.34zm-1.5 4.72c.28 0 .5.22.5.5 0 .55.45 1 1 1 .28 0 .5.22.5.5s-.22.5-.5.5c-1.1 0-2-.9-2-2 0-.28.22-.5.5-.5z\" transform=\"translate(1)\"\/><\/svg><\/span><\/div>\n\n\n<style>.kt-svg-item-526_67e624-24 .kb-svg-icon-wrap, .kt-svg-style-stacked.kt-svg-item-526_67e624-24 .kb-svg-icon-wrap{color:#1167d8;font-size:40px;}<\/style>\n<div class=\"wp-block-kadence-single-icon kt-svg-style-default kt-svg-icon-wrap kt-svg-item-526_67e624-24\"><span class=\"kb-svg-icon-wrap kb-svg-icon-ic_circular\"><svg viewbox=\"0 0 8 8\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M4 0c-1.65 0-3 1.35-3 3h-1l1.5 2 1.5-2h-1c0-1.11.89-2 2-2v-1zm2.5 1l-1.5 2h1c0 1.11-.89 2-2 2v1c1.65 0 3-1.35 3-3h1l-1.5-2z\" transform=\"translate(0 1)\"\/><\/svg><\/span><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-center has-text-color has-link-color wp-elements-11\" style=\"border-top-left-radius:216px;border-top-right-radius:216px;border-bottom-left-radius:216px;border-bottom-right-radius:216px;color:#245fb8\">Two Circulations Working as One<\/h2>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-4fc3f8e1 wp-block-group-is-layout-flex\">\n<p class=\"wp-block-paragraph\">Although blood follows one continuous route, circulation is commonly divided into two major circuits.<\/p>\n\n\n\n<div class=\"wp-block-group has-border-color has-background\" style=\"border-color:#cedff2;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;background-color:#f4f9ff;padding-top:12px;padding-right:12px;padding-bottom:12px;padding-left:12px\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-container-core-group-is-layout-71739e78 wp-block-group-is-layout-constrained\">\n<h4 class=\"wp-block-heading has-text-align-center has-text-color has-link-color wp-elements-12\" style=\"color:#245fb8\">          Pulmonary Circulation<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Pulmonary circulation moves blood between the <strong>heart and lungs<\/strong>.<\/p>\n\n\n\n<p class=\"has-text-align-center has-border-color has-theme-palette-8-background-color has-background wp-block-paragraph\" style=\"border-color:#9ec4f0;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;padding-top:5px;padding-bottom:5px\"><strong>Right ventricle \u2192 pulmonary arteries \u2192 lungs \u2192 pulmonary veins \u2192 left atrium<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Its major purpose is to allow blood to release carbon dioxide and acquire oxygen.<\/p>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group has-border-color has-background\" style=\"border-color:#cedff2;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;background-color:#f4f9ff;padding-top:12px;padding-right:12px;padding-bottom:12px;padding-left:12px\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-container-core-group-is-layout-71739e78 wp-block-group-is-layout-constrained\">\n<h4 class=\"wp-block-heading has-text-align-center has-text-color has-link-color wp-elements-13\" style=\"color:#245fb8\">          Systemic Circulation<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Systemic circulation moves blood between the <strong>heart and the rest of the body<\/strong>.<\/p>\n\n\n\n<p class=\"has-text-align-center has-border-color has-theme-palette-8-background-color has-background wp-block-paragraph\" style=\"border-color:#9ec4f0;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;padding-top:5px;padding-bottom:5px\"><strong>Left ventricle \u2192 aorta \u2192 arteries \u2192 capillaries \u2192 veins\u2192 venae cavae\u2192 right atrium<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This circuit delivers oxygen and nutrients to tissues while carrying metabolic waste products away.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Together, these two circuits form a continuous cardiovascular loop.<\/p>\n<\/div><\/div>\n<\/div>\n\n\n\n<figure class=\"wp-block-video aligncenter\" style=\"margin-top:var(--wp--preset--spacing--40);margin-right:var(--wp--preset--spacing--20);margin-bottom:var(--wp--preset--spacing--40);margin-left:var(--wp--preset--spacing--20)\"><video height=\"720\" style=\"aspect-ratio: 1280 \/ 720;\" width=\"1280\" autoplay controls muted src=\"https:\/\/medatlashealth.com\/wp-content\/uploads\/2026\/08\/Red-blood-cell-circulating-1.mp4\"><\/video><\/figure>\n\n\n\n<div class=\"wp-block-group medatlas-h2 has-border-color has-background is-content-justification-center is-nowrap is-layout-flex wp-container-core-group-is-layout-930d7113 wp-block-group-is-layout-flex\" style=\"border-color:#cedff2;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;background-color:#f4f9ff;padding-top:12px;padding-right:12px;padding-bottom:12px;padding-left:12px\"><style>.kt-svg-icons526_ad7c26-33 .kt-svg-item-0 .kb-svg-icon-wrap{color:var(--global-palette4, #2D3748);font-size:50px;}.wp-block-kadence-icon.kt-svg-icons526_ad7c26-33{justify-content:center;}<\/style>\n<div class=\"wp-block-kadence-icon kt-svg-icons kt-svg-icons526_ad7c26-33 alignnone\"><style>.kt-svg-item-526_f2789a-55 .kb-svg-icon-wrap, .kt-svg-style-stacked.kt-svg-item-526_f2789a-55 .kb-svg-icon-wrap{color:#f31a1a;font-size:40px;}<\/style>\n<div class=\"wp-block-kadence-single-icon kt-svg-style-default kt-svg-icon-wrap kt-svg-item-526_f2789a-55\"><span class=\"kb-svg-icon-wrap kb-svg-icon-ic_droplet\"><svg viewbox=\"0 0 8 8\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M3 0l-.34.34c-.11.11-2.66 2.69-2.66 4.88 0 1.65 1.35 3 3 3s3-1.35 3-3c0-2.18-2.55-4.77-2.66-4.88l-.34-.34zm-1.5 4.72c.28 0 .5.22.5.5 0 .55.45 1 1 1 .28 0 .5.22.5.5s-.22.5-.5.5c-1.1 0-2-.9-2-2 0-.28.22-.5.5-.5z\" transform=\"translate(1)\"\/><\/svg><\/span><\/div>\n\n\n<style>.kt-svg-item-526_3f25c8-2c .kb-svg-icon-wrap, .kt-svg-style-stacked.kt-svg-item-526_3f25c8-2c .kb-svg-icon-wrap{color:#1167d8;font-size:40px;}<\/style>\n<div class=\"wp-block-kadence-single-icon kt-svg-style-default kt-svg-icon-wrap kt-svg-item-526_3f25c8-2c\"><span class=\"kb-svg-icon-wrap kb-svg-icon-ic_circular\"><svg viewbox=\"0 0 8 8\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M4 0c-1.65 0-3 1.35-3 3h-1l1.5 2 1.5-2h-1c0-1.11.89-2 2-2v-1zm2.5 1l-1.5 2h1c0 1.11-.89 2-2 2v1c1.65 0 3-1.35 3-3h1l-1.5-2z\" transform=\"translate(0 1)\"\/><\/svg><\/span><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-center has-text-color has-link-color wp-elements-14\" style=\"border-top-left-radius:216px;border-top-right-radius:216px;border-bottom-left-radius:216px;border-bottom-right-radius:216px;color:#245fb8\">Why Continuous Blood Flow Matters<\/h2>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-4fc3f8e1 wp-block-group-is-layout-flex\">\n<p class=\"wp-block-paragraph\">Your cells require a continuous supply of oxygen and nutrients to function.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The cardiovascular system provides that supply while also helping transport carbon dioxide, metabolic waste, hormones, immune cells and many other substances throughout the body.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Some organs are particularly sensitive to interruptions in blood flow.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The brain and heart, for example, depend heavily on a continuous oxygen supply.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is why serious disruptions to circulation \u2014 such as cardiac arrest or blockage of an important blood vessel \u2014 can rapidly become medical emergencies.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Healthy circulation is not simply about moving blood.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It is about maintaining the environment that allows trillions of cells to remain alive and function together.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group medatlas-h2 has-border-color has-background is-content-justification-center is-nowrap is-layout-flex wp-container-core-group-is-layout-930d7113 wp-block-group-is-layout-flex\" style=\"border-color:#cedff2;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;background-color:#f4f9ff;padding-top:12px;padding-right:12px;padding-bottom:12px;padding-left:12px\"><style>.kt-svg-icons526_76df16-a0 .kt-svg-item-0 .kb-svg-icon-wrap{color:var(--global-palette4, #2D3748);font-size:50px;}.wp-block-kadence-icon.kt-svg-icons526_76df16-a0{justify-content:center;}<\/style>\n<div class=\"wp-block-kadence-icon kt-svg-icons kt-svg-icons526_76df16-a0 alignnone\"><style>.kt-svg-item-526_4e2c0c-c5 .kb-svg-icon-wrap, .kt-svg-style-stacked.kt-svg-item-526_4e2c0c-c5 .kb-svg-icon-wrap{color:#f31a1a;font-size:40px;}<\/style>\n<div class=\"wp-block-kadence-single-icon kt-svg-style-default kt-svg-icon-wrap kt-svg-item-526_4e2c0c-c5\"><span class=\"kb-svg-icon-wrap kb-svg-icon-ic_droplet\"><svg viewbox=\"0 0 8 8\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M3 0l-.34.34c-.11.11-2.66 2.69-2.66 4.88 0 1.65 1.35 3 3 3s3-1.35 3-3c0-2.18-2.55-4.77-2.66-4.88l-.34-.34zm-1.5 4.72c.28 0 .5.22.5.5 0 .55.45 1 1 1 .28 0 .5.22.5.5s-.22.5-.5.5c-1.1 0-2-.9-2-2 0-.28.22-.5.5-.5z\" transform=\"translate(1)\"\/><\/svg><\/span><\/div>\n\n\n<style>.kt-svg-item-526_c3dea9-87 .kb-svg-icon-wrap, .kt-svg-style-stacked.kt-svg-item-526_c3dea9-87 .kb-svg-icon-wrap{color:#1167d8;font-size:40px;}<\/style>\n<div class=\"wp-block-kadence-single-icon kt-svg-style-default kt-svg-icon-wrap kt-svg-item-526_c3dea9-87\"><span class=\"kb-svg-icon-wrap kb-svg-icon-ic_circular\"><svg viewbox=\"0 0 8 8\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M4 0c-1.65 0-3 1.35-3 3h-1l1.5 2 1.5-2h-1c0-1.11.89-2 2-2v-1zm2.5 1l-1.5 2h1c0 1.11-.89 2-2 2v1c1.65 0 3-1.35 3-3h1l-1.5-2z\" transform=\"translate(0 1)\"\/><\/svg><\/span><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-center has-text-color has-link-color wp-elements-15\" style=\"border-top-left-radius:190px;border-top-right-radius:190px;border-bottom-left-radius:190px;border-bottom-right-radius:190px;color:#245fb8\">One Tiny Cell, One Extraordinary Journey<\/h2>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-4fc3f8e1 wp-block-group-is-layout-flex\">\n<p class=\"wp-block-paragraph\">A red blood cell is microscopic.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Yet its journey reveals one of the most remarkable systems in human biology.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It travels from tissues to the right side of the heart, through the lungs, into the left side of the heart and then through an enormous branching network of arteries and capillaries before returning again.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Your heart provides the force.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Your blood vessels provide the pathways.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Your lungs provide the oxygen.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">And red blood cells provide the transport.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">All of it happens automatically \u2014 every second, every minute and every day.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The next time you feel your heartbeat, remember:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You are feeling the pump behind billions of microscopic journeys taking place throughout your body at that very moment.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group has-border-color has-background\" style=\"border-color:#cedff2;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;background-color:#f4f9ff;padding-top:10px;padding-right:18px;padding-bottom:10px;padding-left:18px\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-container-core-group-is-layout-5efda55f wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-group medatlas-h2 has-border-color has-background is-content-justification-center is-nowrap is-layout-flex wp-container-core-group-is-layout-930d7113 wp-block-group-is-layout-flex\" style=\"border-color:#cedff2;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;background-color:#f4f9ff;padding-top:12px;padding-right:12px;padding-bottom:12px;padding-left:12px\"><style>.kt-svg-icons526_fc8290-55 .kt-svg-item-0 .kb-svg-icon-wrap{color:var(--global-palette4, #2D3748);font-size:50px;}.wp-block-kadence-icon.kt-svg-icons526_fc8290-55{justify-content:center;}<\/style>\n<div class=\"wp-block-kadence-icon kt-svg-icons kt-svg-icons526_fc8290-55 alignnone\"><style>.kt-svg-item-526_c4946b-e8 .kb-svg-icon-wrap, .kt-svg-style-stacked.kt-svg-item-526_c4946b-e8 .kb-svg-icon-wrap{color:#f31a1a;font-size:40px;}<\/style>\n<div class=\"wp-block-kadence-single-icon kt-svg-style-default kt-svg-icon-wrap kt-svg-item-526_c4946b-e8\"><span class=\"kb-svg-icon-wrap kb-svg-icon-ic_droplet\"><svg viewbox=\"0 0 8 8\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M3 0l-.34.34c-.11.11-2.66 2.69-2.66 4.88 0 1.65 1.35 3 3 3s3-1.35 3-3c0-2.18-2.55-4.77-2.66-4.88l-.34-.34zm-1.5 4.72c.28 0 .5.22.5.5 0 .55.45 1 1 1 .28 0 .5.22.5.5s-.22.5-.5.5c-1.1 0-2-.9-2-2 0-.28.22-.5.5-.5z\" transform=\"translate(1)\"\/><\/svg><\/span><\/div>\n\n\n<style>.kt-svg-item-526_615b1c-30 .kb-svg-icon-wrap, .kt-svg-style-stacked.kt-svg-item-526_615b1c-30 .kb-svg-icon-wrap{color:#1167d8;font-size:40px;}<\/style>\n<div class=\"wp-block-kadence-single-icon kt-svg-style-default kt-svg-icon-wrap kt-svg-item-526_615b1c-30\"><span class=\"kb-svg-icon-wrap kb-svg-icon-ic_circular\"><svg viewbox=\"0 0 8 8\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M4 0c-1.65 0-3 1.35-3 3h-1l1.5 2 1.5-2h-1c0-1.11.89-2 2-2v-1zm2.5 1l-1.5 2h1c0 1.11-.89 2-2 2v1c1.65 0 3-1.35 3-3h1l-1.5-2z\" transform=\"translate(0 1)\"\/><\/svg><\/span><\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading has-text-color has-link-color wp-elements-16\" style=\"border-top-left-radius:193px;border-top-right-radius:193px;border-bottom-left-radius:193px;border-bottom-right-radius:193px;color:#245fb8\">\u010cesto postavljana pitanja<\/h3>\n<\/div>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Do arteries always carry oxygen-rich blood?<\/summary>\n<p class=\"has-border-color has-theme-palette-9-background-color has-background wp-block-paragraph\" style=\"border-color:#cedff2;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;padding-top:12px;padding-right:12px;padding-bottom:12px;padding-left:12px\">No. Arteries are defined as blood vessels that carry blood away from the heart. The pulmonary arteries carry oxygen-poor blood from the right ventricle to the lungs.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Do veins always carry oxygen-poor blood?<\/summary>\n<p class=\"has-border-color has-theme-palette-9-background-color has-background wp-block-paragraph\" style=\"border-color:#cedff2;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;padding-top:12px;padding-right:12px;padding-bottom:12px;padding-left:12px\">No. Veins carry blood toward the heart. Pulmonary veins are an important exception because they transport oxygen-rich blood from the lungs to the left atrium.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Where does blood pick up oxygen?<\/summary>\n<p class=\"has-border-color has-theme-palette-9-background-color has-background wp-block-paragraph\" style=\"border-color:#cedff2;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;padding-top:12px;padding-right:12px;padding-bottom:12px;padding-left:12px\">Blood becomes oxygenated primarily in pulmonary capillaries surrounding the alveoli in the lungs. Oxygen crosses from the alveoli into the bloodstream and binds to hemoglobin inside red blood cells.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Where does blood release oxygen?<\/summary>\n<p class=\"has-border-color has-theme-palette-9-background-color has-background wp-block-paragraph\" style=\"border-color:#cedff2;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;padding-top:12px;padding-right:12px;padding-bottom:12px;padding-left:12px\">Most oxygen delivery occurs in systemic capillaries, where oxygen moves from blood toward surrounding tissues.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>What prevents blood from flowing backward through the heart?<\/summary>\n<p class=\"has-border-color has-theme-palette-9-background-color has-background wp-block-paragraph\" style=\"border-color:#cedff2;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;padding-top:12px;padding-right:12px;padding-bottom:12px;padding-left:12px\">Four heart valves \u2014 the tricuspid, pulmonary, mitral and aortic valves \u2014 help maintain one-directional blood flow through the heart.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>What is the difference between pulmonary and systemic circulation?<\/summary>\n<p class=\"has-border-color has-theme-palette-9-background-color has-background wp-block-paragraph\" style=\"border-color:#cedff2;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;padding-top:12px;padding-right:12px;padding-bottom:12px;padding-left:12px\">Pulmonary circulation carries blood between the heart and lungs. Systemic circulation carries blood between the heart and the rest of the body.<\/p>\n<\/details>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group has-border-color\" style=\"border-color:#cedff2;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;padding-top:12px;padding-right:12px;padding-bottom:12px;padding-left:12px\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-container-core-group-is-layout-71739e78 wp-block-group-is-layout-constrained\">\n<h4 class=\"wp-block-heading has-text-align-center\">Medicinska napomena<\/h4>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\">Ovaj \u010dlanak je namenjen isklju\u010divo u edukativne svrhe i ne predstavlja zamenu za stru\u010dni medicinski savet, dijagnozu ili le\u010denje. Uporne ili zabrinjavaju\u0107e respiratorne simptome treba da proceni kvalifikovani zdravstveni radnik.<\/p>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group has-border-color\" style=\"border-color:#cedff2;border-width:1px;border-top-left-radius:18px;border-top-right-radius:18px;border-bottom-left-radius:18px;border-bottom-right-radius:18px;padding-top:10px;padding-right:10px;padding-bottom:10px;padding-left:10px\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-container-core-group-is-layout-dc33374f wp-block-group-is-layout-constrained\">\n<h4 class=\"wp-block-heading has-text-align-center\"><strong>References &amp; Medical Sources<\/strong><\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>American Heart Association (AHA)<\/strong> \u2014 <em>How the Healthy Heart Works<\/em><\/li>\n\n\n\n<li><strong>Cleveland Clinic<\/strong> \u2014 <em>How Does Blood Flow Through Your Heart?<\/em><\/li>\n\n\n\n<li><strong>Cleveland Clinic<\/strong> \u2014 <em>Circulatory System<\/em><\/li>\n\n\n\n<li><strong>MedlinePlus<\/strong> \u2014 <em>Heart and Circulation<\/em><\/li>\n\n\n\n<li><strong>National Heart, Lung, and Blood Institute (NHLBI)<\/strong> \u2014 <em>How the Heart Works<\/em><\/li>\n<\/ol>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Every second of your life, trillions of red blood cells are traveling through an extraordinary network of blood vessels. They move&#8230;<\/p>","protected":false},"author":1,"featured_media":523,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[18],"tags":[52,56,53,54,51,55],"class_list":["post-526","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-inside-the-human-body","tag-blood-circulation","tag-blood-flow-through-the-body","tag-how-blood-flows-through-the-heart","tag-pulmonary-circulation","tag-red-blood-cell-journey","tag-systemic-circulation"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How Blood 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