Question

$\underline \mathbf{QuesTion - }$
First heart sound is :-
(a) Lubb sound at the end of systole.
(b) Lubb sound at the beginning of ventricular systole.
(c) Dupp sound at the end of systole.
(d) Dupp sound at the beginning of ventricular systole.

${ \red{ \underline{ \mathrm{Note - }}}}$
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Answer 1

Answer:

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Explanation:

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Answer 2

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${\pink{\implies}}$(b)Lubb sound at the beginning of ventricular systole.