Which heart sound is associated with the closure of the atrioventricular valves?

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Multiple Choice

Which heart sound is associated with the closure of the atrioventricular valves?

Explanation:
The sound heard when the atrioventricular valves close is the first heart sound, S1. It happens as the ventricles begin to contract and the mitral and tricuspid valves snap shut, signaling the start of systole. S2, by contrast, comes from the closure of the semilunar valves at the end of systole, marking the start of diastole. S3 and S4 are additional sounds related to ventricular filling and atrial contraction, not valve closure. So the closure of the AV valves corresponds to S1.

The sound heard when the atrioventricular valves close is the first heart sound, S1. It happens as the ventricles begin to contract and the mitral and tricuspid valves snap shut, signaling the start of systole. S2, by contrast, comes from the closure of the semilunar valves at the end of systole, marking the start of diastole. S3 and S4 are additional sounds related to ventricular filling and atrial contraction, not valve closure. So the closure of the AV valves corresponds to S1.

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