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PANCE Practice Test

Category - PA

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The closing of which valves is responsible for producing the first heart sound?

Mitral and tricuspid valves
Aortic and tricuspid valves
Aortic and pulmonic valves
Aortic and mitral valves

Explanation

Answer: A - The first heart sound is caused by the sudden blockage of reverse blood flow due to closure of the atrioventricular valves, i.e. mitral and tricuspid, at the beginning of ventricular contraction, or systole.

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