Biology Body Fluids and Circulation Double Circulation and Regulation of Cardiac Activity, Cardiac Cycle,Heart Sound Single Correct MCQ
Published on: August 13, 2026

The heart sound "DUP" is Produced when :-

A
Mitral valve opens
B
Mitral valve closes
C
Semilunar valve at the base of aorta closes
D
Tricuspid valve opens

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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 or dup) is associated with the closure of the semilunar valves. These sounds are of clinical diagnostic significance.

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