![]() Valves are actually flaps (leaflets) that act as one-way inlets for blood coming into a ventricle and one-way outlets for blood leaving a ventricle. Normal valves have 3 flaps (leaflets), except the mitral valve. The valves prevent the backward flow of blood. Blood passes through a valve before leaving each chamber of the heart. The heart has 4 chambers, 2 upper chambers (atria) and 2 lower chambers (ventricles). Anatomy and Function of the Heart Valves What are heart valves?
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