What makes the first heart sound “Lubb” S1?

Here is the answer for the question – What makes the first heart sound “Lubb” S1?. You’ll find the correct answer below

What makes the first heart sound “Lubb” S1?

The Correct Answer is

The snapping shut of the AV valves (tricuspid and mitral)

Reason Explained

The snapping shut of the AV valves (tricuspid and mitral) is correct for What makes the first heart sound “Lubb” S1?

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