Which of the following is correct for the first heart sound?
A) It occurs when the AV valves close.
B) It occurs when the semilunar valves close.
C) It signals the onset of ventricular systole.
D) It occurs when the AV valves close and signals the onset of ventricular systole.
Correct Answer:
Verified
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Q48: What produces the second heart sound?
A) opening
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