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 marks the start of ventricular systole and is produced by the closure of the atrioventricular valves as the ventricles contract. The mitral and tricuspid valves close, creating the first heart sound (the “lub”). The semilunar valves (aortic and pulmonary) close later in systole, producing the second heart sound (the “dub”). So the valves responsible for S1 are the mitral and tricuspid valves.

S1 marks the start of ventricular systole and is produced by the closure of the atrioventricular valves as the ventricles contract. The mitral and tricuspid valves close, creating the first heart sound (the “lub”). The semilunar valves (aortic and pulmonary) close later in systole, producing the second heart sound (the “dub”). So the valves responsible for S1 are the mitral and tricuspid valves.

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