Biology Body Fluids and Circulation Double Circulation and Regulation of Cardiac Activity, Cardiac Cycle,Heart Sound Single Correct MCQ
Published on: August 14, 2026

The 'Lubb' and "Dup" heart sound are due to :-

A
Opening of heart valves
B
Action of papillary muscles
C
Closing of heart valves
D
Activity of pace maker

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During each cardiac cycle, two prominent sounds are produced, which can easily heard through a stethoscope. The first heart sound (lubb) is associate with the closure of the tricuspid and bicuspid valves, whereas the second he sound (dubb) is associated with the closure of the semilunar valves. These sounds are of clinical diagnostic significance.

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