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First heart sound occurs at...

First heart sound occurs at

A

opening of semilunar valve

B

closing of semilunar valve

C

onset of auricular systole

D

sudden closure of AV vaives

Text Solution

Verified by Experts

The correct Answer is:
D
The antrioventricular (AV) valve closes due to sharp rise of intraventricular pressure, thus closing of it produces first heart sound 'lub'.
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