CVS Practice Test 2025 – The All-In-One Guide to Exam Success!

Question: 1 / 400

Which valves closing generates the S2 heart sound?

Aortic and mitral valves

Pulmonic and tricuspid valves

Aortic and pulmonic valves

The S2 heart sound is generated by the closure of the aortic and pulmonic valves. This sound occurs at the end of systole when the ventricles eject blood into the aorta and pulmonary artery. As the ventricles relax and the pressure within them drops, the aortic valve and pulmonic valve close to prevent the backflow of blood. The closing of these valves creates a distinct sound that can be heard through a stethoscope and is crucial in the cardiac cycle as it marks the transition from systole to diastole.

The other choices do not include the correct combination of valves associated with the S2 sound. While the tricuspid and mitral valves do contribute to the S1 sound through their closure at the beginning of systole, they are not responsible for the S2 sound. Therefore, the correct identification of the aortic and pulmonic valves is essential for understanding heart sounds and their implications in cardiac function.

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Tricuspid and mitral valves

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