NEET UG BIOLOGY MCQ: BODY FLUIDS AND CIRCULATION

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The first heart sound 'Lubb' occurs in which phase of the cardiac cycle?

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Correct option: C

Ventricular systole

Option C (Ventricular systole) is correct because the first heart sound ('Lubb') is produced by the closure of the atrioventricular (AV) valves at the beginning of ventricular systole.

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