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CGP EDU Academic Team
Published on: August 13, 2026
Doctors use stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when:
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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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