S2 marks the end of which cardiac event?

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Multiple Choice

S2 marks the end of which cardiac event?

Explanation:
S2 marks the end of ventricular systole. It is produced by the closure of the semilunar valves—the aortic and pulmonary valves—as the ventricle finishes ejecting blood and begins to relax. This sound signals the start of ventricular diastole. Clinically, S2 can be described as a “dupp” and is often heard with two components (A2 from the aortic valve and P2 from the pulmonary valve), which may be split on inspiration.

S2 marks the end of ventricular systole. It is produced by the closure of the semilunar valves—the aortic and pulmonary valves—as the ventricle finishes ejecting blood and begins to relax. This sound signals the start of ventricular diastole. Clinically, S2 can be described as a “dupp” and is often heard with two components (A2 from the aortic valve and P2 from the pulmonary valve), which may be split on inspiration.

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