Home Biology Body Fluids and Circulation General The first heart sound is
Biology Body Fluids and Circulation General Single Correct MCQ
Published on: August 11, 2026

The first heart sound is

A
‘LUBB’ sound produced at the end of systole.
B
‘DUP’ sound produced at the end of systole.
C
‘LUBB’ at the beginning of ventricular systole.
D
‘DUP’ sound produced at the beginning of systole

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The correct answer is:
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First and second heart sounds are produced when the AV vlaves and semilunar valves closes respectively at the beginning of ventricular systole and ventricular diastole respectively.

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