What are Heart Valves?

Image courtesy of MedValet

Valves are flap-like structures that allow blood to flow in one direction. The heart has two kinds of valves, atrioventricular and semilunar valves.

The atrioventricular valves are thin structures that are composed of endocardium and connective tissue. They are located between the atria and the ventricles.

The semilunar valves are flaps of endocardium that are shaped like a half moon. They are located between the aorta and the left ventricle and between the pulmonary artery and the right ventricle.

Learn more about the heart, see:

• Anatomy of the Heart
  
• Cardiovascular System Quiz