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

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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