When the semilunar valves close, backflow of blood into the ventricles is prevented and the S1 heart sound can be heard.

Name: When the semilunar valves close, backflow of blood into the ventricles is prevented and the S1 heart sound can be heard.
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Question

Quizplus · Accepted Answer

The S1 heart sound is associated with the closure of the atrioventricular valves (mitral and tricuspid), not the semilunar valves. The semilunar valves (aortic and pulmonary) close to prevent backflow into the ventricles, producing the S2 heart sound.

When the Semilunar Valves Close, Backflow of Blood into the Ventricles