The first heart sound is produced by the_____________?
Correct answer: C. Closure of the mitral and tricuspid valves
- A. Closure of the aortic and pulmonary valves
- B. Opening of the aortic and pulmonary valves
- C. Closure of the mitral and tricuspid valves
- D. Opening of the mitral and tricuspid valves
Explanation
The first heart sound (S1) occurs at the beginning of ventricular systole when the atrioventricular valves, mitral and tricuspid, close. The semilunar valves close later and produce the second heart sound (S2).
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