Which heart sound is produced by closure of the AV valves?

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Multiple Choice

Which heart sound is produced by closure of the AV valves?

Explanation:
The first heart sound is produced when the atrioventricular valves (the mitral and tricuspid valves) close as the ventricles begin to contract. This abrupt closure creates vibrations in the heart and surrounding vessels, which you hear as S1. It marks the start of systole. In contrast, the second heart sound comes from the semilunar valves closing at the end of systole, while S3 and S4 are additional sounds linked to rapid ventricular filling and atrial contraction against a stiff ventricle, respectively. So the closure of the AV valves corresponds to the first heart sound.

The first heart sound is produced when the atrioventricular valves (the mitral and tricuspid valves) close as the ventricles begin to contract. This abrupt closure creates vibrations in the heart and surrounding vessels, which you hear as S1. It marks the start of systole. In contrast, the second heart sound comes from the semilunar valves closing at the end of systole, while S3 and S4 are additional sounds linked to rapid ventricular filling and atrial contraction against a stiff ventricle, respectively. So the closure of the AV valves corresponds to the first heart sound.

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