The heart's primary function is to pump blood to all parts of the body, bringing nutrients and oxygen to tissues and removing waste products from them. Even when our body is at rest, our tissues ...

Your circulatory system contains three blood vessel types: arteries, veins, and capillaries. Arteries carry blood from the heart, unlike veins, which carry blood to the heart. According to the ...

Your Blood Vessels Could Circle Earth Four Times Laid end to end, an adult's blood vessels could circle Earth's equator four ...

Consider for a moment that every instant of consciousness and healthy bodily function is brought to you, in large part, by a steady supply of blood to your vital organs. You know it happens via an ...

Red blood cells carry oxygen from the lungs to every other organ, and blood-forming stem cells must make about 200 billion new red blood cells each day to keep the oxygen flowing. For many years, ...

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 ...

The amount of blood in your body is generally equivalent to 7% of your body weight. But this is an estimate because it can depend on your sex, where you live, and other factors. Sometimes the amount ...

MIT scientists have found a way to induce cells to form parallel tube-like structures that could one day serve as tiny engineered blood vessels. The researchers found that they can control the cells' ...

DON'T move — you'll perturb your homeostasis! Changing from the recumbent to the erect position results in profound readjustments in cerebral circulatory dynamics; even moments of the arm affect ...

This animated feature, part of the NOVA: "Cut to the Heart" Web site, illustrates how the chambers of the heart contract and relax in synchrony to push blood through the pulmonary and systemic loops ...