With each heartbeat, blood courses through your body. Some traverse arteries from the lungs back to the heart, and some navigate through capillaries in the thinnest layers of your eyelid, almost ...

When you take aspirin for a headache, how does the aspirin know to travel to your head and alleviate the pain? The short answer is, it doesn’t: Molecules can’t transport themselves through the body, ...

A puzzle for millennia, the movement of blood through the body was solved by an English physician in the 17th century, paving the way for modern medical technologies. What do chemotherapy, dialysis, ...