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Doctors use stethoscope to hear the soun...

Doctors use stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when

A

A V node receives signal from SA node

B

AV valves open up

C

Ventricular walls vibrate due to gushing in of blood from atria

D

Semilunar valves close down after the blood flows into vessels from ventricles

Text Solution

Verified by Experts

The correct Answer is:
D
Closure of Bicuspid & tricuspid valve produces first heart sound (lubb) while of semilunar valve produces second heart sound (Dup).
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