Which statement correctly describes the S2 heart sound?

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Multiple Choice

Which statement correctly describes the S2 heart sound?

Explanation:
S2 is produced by the closing of the semilunar valves (aortic and pulmonic) at the end of systole, signaling the start of diastole. At that moment the AV valves (mitral and tricuspid) are open, allowing ventricular filling as diastole begins. Therefore, describing S2 as the semilunar valves closing while the AV valves are open is the correct depiction. The other statements misstate which valves close or open during S2 (or conflate S2 with actions of the AV valves), so they don’t fit this event.

S2 is produced by the closing of the semilunar valves (aortic and pulmonic) at the end of systole, signaling the start of diastole. At that moment the AV valves (mitral and tricuspid) are open, allowing ventricular filling as diastole begins. Therefore, describing S2 as the semilunar valves closing while the AV valves are open is the correct depiction. The other statements misstate which valves close or open during S2 (or conflate S2 with actions of the AV valves), so they don’t fit this event.

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