S1 heart sounds are produced by the closure of which valves?

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Multiple Choice

S1 heart sounds are produced by the closure of which valves?

Explanation:
First heart sound comes from the closure of the atrioventricular valves as the ventricle starts pumping blood. This involves both the mitral valve on the left and the tricuspid valve on the right, which shut at the beginning of ventricular systole and produce that characteristic “lub.” The semilunar valves (aortic and pulmonary) close a bit later to generate the second heart sound, the “dub.” So S1 is best explained by the mitral and tricuspid valve closures, rather than the semilunar valves, which is why that option is correct.

First heart sound comes from the closure of the atrioventricular valves as the ventricle starts pumping blood. This involves both the mitral valve on the left and the tricuspid valve on the right, which shut at the beginning of ventricular systole and produce that characteristic “lub.” The semilunar valves (aortic and pulmonary) close a bit later to generate the second heart sound, the “dub.” So S1 is best explained by the mitral and tricuspid valve closures, rather than the semilunar valves, which is why that option is correct.

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