The second heart sound (dup) is:
A) the sound of ventricular muscle contracting
B) the sound of cuspid (AV) valves closing during ventricular systole
C) the sound of atrial muscle contracting
D) the sound of semilunar valves closing during ventricular diastole
Ans: D) the sound of semilunar valves closing during ventricular diastole
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