Home Biology Body Fluids and Circulation Blood and Lymph Pressure And Vessels First cardiac sound (lub) is associated with…
Biology Body Fluids and Circulation Blood and Lymph Pressure And Vessels Single Correct MCQ
Published on: August 13, 2026

First cardiac sound (lub) is associated with -

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