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Which Action of the Heart Makes the First of the "Lup-Dup

Question 16

Multiple Choice

Which action of the heart makes the first of the "lup-dup" sounds?


A) closing of the atrioventricular valves
B) closing of the pulmonary valve
C) closing of the aortic valve
D) the contraction of the left ventricle
E) the contraction of the right ventricle

Correct Answer:

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