Question:medium

The first sound (S$_1$) 'lubb' is caused by blood turbulence associated with:

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$S_1$ ('Lubb') = Closure of Atrioventricular (AV) valves at start of Ventricular Systole.
$S_2$ ('Dubb') = Closure of Semilur (SL) valves at start of Ventricular Diastole.
Valves opening does NOT produce normal heart sounds!

Updated On: Jul 28, 2026

Opening of atrioventricular valves
Closing of atrioventricular valves
Opening of semilur valves
Closing of semilur valves

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The Correct Option is B

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The first sound (S$_1$) 'lubb' is caused by blood turbulence associated with:

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The Correct Option is B

Solution and Explanation

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