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.

The human body has different parts that help us do things like walk ... Your ribs keep your heart, lung and stomach safe. And your skull acts as a tough shell for your brain.

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 ...