The first and second heart sounds are derived from the opening of the heart valves.

Name: The first and second heart sounds are derived from the opening of the heart valves.
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Question

Quizplus · Accepted Answer

The first heart sound (S1) is primarily caused by the closure of the mitral and tricuspid valves at the beginning of ventricular systole, while the second heart sound (S2) is caused by the closure of the aortic and pulmonary valves at the beginning of ventricular diastole.

The First and Second Heart Sounds Are Derived from the Opening