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1.8 Cardiac cycle  (Page 6/19)

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6 / 19  The first heart sound represents which portion of the cardiac cycle?
A  atrial systole
B  ventricular systole
C  closing of the atrioventricular valves
D  closing of the semilunar valves
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Practice MCQ 4 FlashCards 1 Key Terms 11

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Source:  OpenStax, 101-321-va - vertebrate form and function ii. OpenStax CNX. Jul 22, 2015 Download for free at https://legacy.cnx.org/content/col11850/1.1
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