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

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