How many heart valves are there?
It is widely known the fact that a heart valve normally allows blood flow in only one direction through the heart. There are four valves commonly represented in a mammalian heart. They determine the pathway of blood flow through the heart. The two atrioventricular (AV) valves, which are between the atria and the ventricles, are the mitral valve (also called the bicuspid valve), and the tricuspid valve. Keep in mind that the two semilunar (SL) valves, which are in the arteries leaving the heart, are the aortic valve and the pulmonary valve.