The production of the first heart sound is because of which of the followi

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

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

Ans: (d) Closure of atrioventricular valves

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