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 ...

Human blood is a complex mixture containing: Red blood cells which carry oxygen throughout the body, white blood cells are part of the immune system, platelets which are essential for blood ...

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 ...