Which heart sound marks the end of systole?

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Multiple Choice

Which heart sound marks the end of systole?

Explanation:
End of systole is marked by the second heart sound, which comes from the closure of the aortic and pulmonary (semilunar) valves as the heart transitions from contraction to relaxation. S1 signals the start of systole with the closure of the mitral and tricuspid valves, while S3 and S4 are additional sounds that occur during diastole: S3 during rapid ventricular filling in early diastole, and S4 during atrial contraction against a stiff ventricle late in diastole. So the second heart sound best indicates the end of systole.

End of systole is marked by the second heart sound, which comes from the closure of the aortic and pulmonary (semilunar) valves as the heart transitions from contraction to relaxation. S1 signals the start of systole with the closure of the mitral and tricuspid valves, while S3 and S4 are additional sounds that occur during diastole: S3 during rapid ventricular filling in early diastole, and S4 during atrial contraction against a stiff ventricle late in diastole. So the second heart sound best indicates the end of systole.

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