A) Ventricular walls vibrate due to gushing 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: B
Solution :The second heart sound (dub) is associated with the closure of the semilunar valves. Hence, the correct option is [b].
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