Which statement about the heart sounds is correct?

Practice question

Question

Which statement about the heart sounds is correct?

Options

Choose one · Correct answer highlighted

The "Lub" sound is caused by the closure of the semilunar valves. The "Dub" sound is due to the closure of the AV valves. The "Lub" sound is caused by the closure of the AV valves. Correct Both sounds occur simultaneously.

Explanation

The "Lub" sound occurs when the AV valves (tricuspid and bicuspid) close, while the "Dub" sound occurs when the semilunar valves close.

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