The heart sound “lub” is produced due to:

Practice MCQ for SSC, UPSC, RRB Exams

A. Closure of semilunar valves A.
B. Opening of AV valves B.
C. Closure of AV valves C.
D. Ventricular relaxation D.

Correct Answer: C সঠিক উত্তর: C

Explanation ব্যাখ্যা

The "lub" sound is the first heart sound, and it occurs when the atrioventricular (AV) valves (mitral and tricuspid valves) close at the beginning of ventricular systole (when the ventricles contract). This closure creates the "lub" sound.

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