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which one is the first heart sound ?...

which one is the first heart sound ?

A

Lub' during closure of semilunar valves

B

Lub' during closure of atrioventricular valves

C

Dub' during closure of atrioventricular valves

D

Dub' during closure of semilunar valves

Text Solution

Verified by Experts

The correct Answer is:
B
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