2nd heart sound is characterized by all except______________?
Correct answer: B. Has longer duration than 1st heart sound
- A. Due to closure of semilunar valves
- B. Has longer duration than 1st heart sound
- C. Is occasionally split
- D. Marks the onset of diastole
Explanation
The second heart sound results from closure of the aortic and pulmonary valves, may be physiologically split, and marks the beginning of diastole. It is normally shorter than the first heart sound, so a longer duration is the exception.
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