Q
The first heart sound is produced by the_____________?
-
A
A. Closure of the aortic and pulmonary valves
-
B
B. Opening of the aortic and pulmonary valves
-
C
C. Closure of the mitral and tricuspid valves
-
D
D. Opening of the mitral and tricuspid valves
Correct Answer:
C. C. Closure of the mitral and tricuspid valves