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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 A.V. valves

Text Solution

Verified by Experts

The correct Answer is:
D
The AV-valves close due to sharp rise of intraventricular pressure their closure produces first heart sound LUBB.
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