Multiple Choice
The first heart sound
A) occurs when the AV valves close.
B) occurs when the semilunar valves close.
C) signals the onset of ventricular systole.
D) occurs when the AV valves close and signals the onset of ventricular systole.
E) occurs when the semilunar valves close and signals the onset of ventricular systole.
Correct Answer:
Verified
Correct Answer:
Verified
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