The second heart sound (S2) reflects the closure of which valves?

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Multiple Choice

The second heart sound (S2) reflects the closure of which valves?

Explanation:
S2 is produced when the semilunar valves—the aortic and pulmonary valves—close, marking the end of ventricular systole and the start of diastole. This sound follows the first heart sound, which comes from the closure of the atrioventricular valves at the beginning of systole. Because S2 specifically results from the snapping shut of the semilunar valves, that is why the correct answer is the semilunar valves. (Sometimes a split S2 occurs because the two semilunar valves close at slightly different times, especially with inspiration.)

S2 is produced when the semilunar valves—the aortic and pulmonary valves—close, marking the end of ventricular systole and the start of diastole. This sound follows the first heart sound, which comes from the closure of the atrioventricular valves at the beginning of systole. Because S2 specifically results from the snapping shut of the semilunar valves, that is why the correct answer is the semilunar valves. (Sometimes a split S2 occurs because the two semilunar valves close at slightly different times, especially with inspiration.)

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