First slide

Circulatory Pathways

Question

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

Easy

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 ventricles.

Solution

During each cardiac cycle, two prominent sounds are produced which can be easily heard through a stethoscope. The first heart sound (lub) is associated with the closure of the tricuspid and bicuspid valves whereas the second heart sound (dub) is associated with the closure of the semilunar valves.

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