What are the two main heart sounds and what do they signify?

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Multiple Choice

What are the two main heart sounds and what do they signify?

Explanation:
Two main heart sounds come from valve closures. S1 is the sound you hear at the start of ventricular contraction when the atrioventricular valves (mitral and tricuspid) close. S2 occurs at the start of ventricular relaxation when the semilunar valves (aortic and pulmonary) close, producing the familiar “lub-dub” sequence. The option that pairs S1 with AV valve closure and S2 with semilunar valve closure matches this exactly. The other statements mix up which valves close or refer to valve openings, which do not generate the main heart sounds.

Two main heart sounds come from valve closures. S1 is the sound you hear at the start of ventricular contraction when the atrioventricular valves (mitral and tricuspid) close. S2 occurs at the start of ventricular relaxation when the semilunar valves (aortic and pulmonary) close, producing the familiar “lub-dub” sequence. The option that pairs S1 with AV valve closure and S2 with semilunar valve closure matches this exactly. The other statements mix up which valves close or refer to valve openings, which do not generate the main heart sounds.

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