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

Options

(a) Ventricular wall vibrate due to gushing in of blood from atria
(b) Semilunar valves close down after the blood flows into vessels from ventricles
(c) AV node receives signal from SA node
(d) AV valves open up

Correct Answer:

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

Explanation:

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