Home Biology Body Fluids and Circulation Circulatory Pathways and Human Circulatory System First cardiac sound (lub) is associated with
Biology Body Fluids and Circulation Circulatory Pathways and Human Circulatory System Single Correct MCQ
Published on: August 20, 2026

First cardiac sound (lub) is associated with

A
Closure of tricuspid and bicuspid valves
B
Opening of tricuspid valves
C
Closure of semilunar valves
D
Opening of semilunar valves

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During each cardiac cycle two prominent sounds are produced lub and dub. 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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