Day and night, the muscles of your heart contract and relax to pump blood throughout your body. When blood returns to the heart, it follows a complicated pathway. If you were in the bloodstream ...

Many people do, but the heart is actually located almost in the center of ... takes ten of them to equal the thickness of a human hair. Your body has about 5.6 liters (6 quarts) of blood.

This clip is an introduction to the human heart. We find out about its location within the body and its function as a pump. The heart sits within the chest cavity between the lungs and is about ...

It also shows how the pacemaker cells restart her heart after the surgery. This short film is from the BBC series, Inside the Human Body. The 3D footage brings the topic to life and would enhance ...

Most people know that body fat stored around the midsection can spell disaster for cardiovascular health. But Harvard ...