Here are 11 fun, interesting and perhaps surprising facts about the circulatory system that you may not know. If you were to lay out all of the arteries, capillaries and veins in one adult ...

All the blood vessels in the human body lined up end-to-end would stretch about 100,000 kilometers. That's about two and a half times the earth's circumference. The arteries carry oxygenated blood ...

Your circulatory system works all day, every day, to pump oxygen throughout your body. There are cardiovascular conditions that can impact this system. Your circulatory system, also known as your ...

But do you know all of the functions the circulatory system actually performs? Here are some surprising facts about human blood—and a few cringe-worthy theories that preceded the modern ...

Here on Earth, a person's blood tends to pool in the legs because of gravity (the leg veins have valves that help to maintain blood flow from the legs back up to the heart). Things are different ...