The heart valves prevent the backflow of blood during the cardiac cycle.

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The heart valves, including the atrioventricular valves (tricuspid and bicuspid/mitral) and the semilunar valves (pulmonary and aortic), prevent the backflow of blood during the cardiac cycle. When the ventricles contract, the AV valves close to prevent blood from flowing back into the atria. When the ventricles relax, the semilunar valves close to prevent blood from flowing back into the ventricles from the pulmonary artery and aorta.

The Heart Valves Prevent the Backflow of Blood During the Cardiac