Statement-I: The first heart sound (lub) is a | vedclass

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(D) Statement-$I$ is incorrect because the first heart sound $(lub)$ is produced by the closure of the tricuspid and bicuspid valves at the beginning

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Only statement $II$ is correct

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(D) Statement-$I$ is incorrect because the first heart sound $(lub)$ is produced by the closure of the tricuspid and bicuspid valves at the beginning of ventricular systole,not their opening.Statement-$II$ is correct because athletes have a higher stroke volume and better cardiovascular efficiency,leading to a higher cardiac output compared to an ordinary person.Therefore,only statement $II$ is correct.

Statement-$I$: The first heart sound $(lub)$ is associated with the opening of the tricuspid and bicuspid valves.
Statement-$II$: Cardiac output of an athlete is much higher than that of an ordinary man.

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Statement-$I$: The first heart sound $(lub)$ is associated with the opening of the tricuspid and bicuspid valves.Statement-$II$: Cardiac output of an athlete is much higher than that of an ordinary man.