The production of the first heart sound is because of which of the following? The production of the first heart sound is because of which of the following?  mcq  given below:

Q. The production of the first heart sound is because of which of the following?  (AIIMS Bhopal Nursing officer-2018) 

(a) rushing of blood into ventricle
(b) closure of semilunar valves
(c) contraction of ethereal musculature
(d) Closure of atrioventricular valves

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Ans: (d) Closure of atrioventricular valves
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