Blood flows through the left atrium into the left ventricle. The left ventricle pumps the oxygen-rich blood to all parts of the body. amazing heart facts.

Your circulatory system is made up of three parts: the heart, blood vessels and the blood itself. Your heart keeps all the blood in your circulatory system flowing. The blood travels through a ...

The left ventricle pumps the oxygen-rich blood to all parts of the body. Do right and left seem backward? That's because you're looking at an illustration of somebody else's heart. To think about ...