Which of the following accounts for the heart sounds "lubb-dubb"?
A) closing of the semilunar and atrioventricular valves, respectively
B) opening of the semilunar and atrioventricular valves, respectively
C) closing of the atrioventricular and semilunar valves, respectively
D) opening of the atrioventricular and semilunar valves, respectively
Correct Answer:
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