Which statement correctly matches S1 and S2 heart sounds?

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Multiple Choice

Which statement correctly matches S1 and S2 heart sounds?

Explanation:
The main idea is that heart sounds come from valve closures at specific times in the cardiac cycle. S1 marks the start of ventricular systole when the atrioventricular valves (mitral and tricuspid) close, creating the "lub." S2 marks the end of systole when the semilunar valves (aortic and pulmonary) close, creating the "dub." So the statement that S1 comes from AV valve closure and S2 from the closure of the aortic/pulmonary valves is correct. The other descriptions would involve the wrong valves or refer to opening (which doesn’t produce the audible sounds).

The main idea is that heart sounds come from valve closures at specific times in the cardiac cycle. S1 marks the start of ventricular systole when the atrioventricular valves (mitral and tricuspid) close, creating the "lub." S2 marks the end of systole when the semilunar valves (aortic and pulmonary) close, creating the "dub." So the statement that S1 comes from AV valve closure and S2 from the closure of the aortic/pulmonary valves is correct. The other descriptions would involve the wrong valves or refer to opening (which doesn’t produce the audible sounds).

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