Doctors use stethoscope to hear the sound, produced during each cardiac cycle. The second sound is heard when:
A
AV node receives signal from SA node
B
AV valves
C
Ventricular wall vibrate due to gushing of blood from atria
D
Semilunar valves close down after the blood flows into vessels from Ventricles.
Text Solution
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The correct Answer is:
D
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