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What Action Causes the First Heart Sound Heard Through a Stethoscope

Question 4

Multiple Choice

What action causes the first heart sound heard through a stethoscope?


A) Opening of the semilunar valves
B) Closing of the atrioventricular valves
C) Closing of the semilunar valves
D) Opening of the atrioventricular valves

Correct Answer:

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