NEET Biology question

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

(A)AV 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 ventriclesCorrect

Answer: (D)

Solution

The second heart sound is produced by the closure of the semilunar (aortic and pulmonary) valves once the ventricles have finished ejecting blood into

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Question ID VK-116216