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Medical Science
MEDIUM
ENGLISH
Medical Science
The first heart sound is produced by the_____________?
A
Closure of the aortic and pulmonary valves
Option A
B
Opening of the aortic and pulmonary valves
Option B
Closure of the mitral and tricuspid valves
Correct answer
D
Opening of the mitral and tricuspid valves
Option D
Correct answer: C
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