S2 heart sounds are produced by closure of which valves?

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Multiple Choice

S2 heart sounds are produced by closure of which valves?

Explanation:
S2 comes from the closure of the semilunar valves at the end of ventricular systole. When the ventricles finish contracting, the pressure in the aorta and pulmonary artery rises above ventricular pressure, causing the aortic and pulmonic valves to snap shut. This produces the second heart sound, often heard as two components: A2 (aortic) and P2 (pulmonic). A2 is usually louder, and a brief inspiratory split can occur because P2 is delayed with inspiration. This is in contrast to S1, which is due to the closure of the atrioventricular valves at the start of systole.

S2 comes from the closure of the semilunar valves at the end of ventricular systole. When the ventricles finish contracting, the pressure in the aorta and pulmonary artery rises above ventricular pressure, causing the aortic and pulmonic valves to snap shut. This produces the second heart sound, often heard as two components: A2 (aortic) and P2 (pulmonic). A2 is usually louder, and a brief inspiratory split can occur because P2 is delayed with inspiration. This is in contrast to S1, which is due to the closure of the atrioventricular valves at the start of systole.

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