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

Question

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

Accepted Answer

During each cardiac cycle, two prominent sounds are produced which can be heard through a stethoscope. The first heart sound (lub) is associated with the closure of the tricuspid and bicuspid valves. The second heart sound (dub) is associated with the closure of the semilunar valves, which occurs when the ventricles relax (ventricular diastole) preventing backflow from the vessels , .

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