The first heart sound (lub) is produced by the closing of the ____ and ____ valves.
A) aortic semilunar; pulmonary semilunar
B) right atrioventricular; aortic semilunar
C) left atrioventricular; pulmonary semilunar
D) right atrioventricular; left atrioventricular
E) mitral; left atrioventricular
Correct Answer:
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