How Your Eyes Turn Light Into Vision
Discover the fascinating science of human vision. Learn how light enters your eyes, activates photoreceptors in the retina, and travels through the optic nerve to become the images you see.
What Happens to Your Body When You Drink Alcohol?
Discover what happens to your body when you drink alcohol, including its effects on the brain, liver, heart, blood sugar, and sleep, as well as the long-term health risks.
How Smoking Damages Your Lungs: What Happens Inside Your Airways?
Learn how smoking damages your lungs, from airway irritation and chronic inflammation to damaged cilia and alveoli, and discover how these changes can affect breathing and long-term lung health.
How Your Ears Turn Sound Into Hearing
Learn how your ears transform sound waves into electrical signals your brain can understand, from the outer ear and eardrum to the cochlea, auditory nerve, and perception of sound.
How Blood Circulates Through Your Body: The Journey of a Red Blood Cell
Learn how blood circulates through your body by following the journey of a red blood cell through the heart, lungs, arteries, capillaries, and veins.
How Do the Lungs Work?
Learn how the lungs work, how oxygen enters the bloodstream, how carbon dioxide is removed, and how breathing and gas exchange keep your body functioning.
