The S1 heart sound corresponds to the closure of which valves?

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Multiple Choice

The S1 heart sound corresponds to the closure of which valves?

Explanation:
S1 is the sound created when the atrioventricular valves—the mitral and tricuspid valves—close at the start of ventricular systole. As the ventricles contract, pressure rises above filling pressures in the atria, causing the AV valves to shut to prevent backflow, producing the characteristic “lub.” The semilunar valves (aortic and pulmonary) close a bit later, marking S2. So S1 specifically reflects AV valve closure, not the semilunar valves.

S1 is the sound created when the atrioventricular valves—the mitral and tricuspid valves—close at the start of ventricular systole. As the ventricles contract, pressure rises above filling pressures in the atria, causing the AV valves to shut to prevent backflow, producing the characteristic “lub.” The semilunar valves (aortic and pulmonary) close a bit later, marking S2. So S1 specifically reflects AV valve closure, not the semilunar valves.

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