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11.3 Circulatory and respiratory systems  (Page 8/39)

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8 / 39  During the systolic phase of the cardiac cycle, the heart is ________.
A  contracting
B  relaxing
C  contracting and relaxing
D  filling with blood
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Practice MCQ 5 FlashCards 3 Key Terms 27

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Source:  OpenStax, University of georgia biology. OpenStax CNX. Dec 09, 2013 Download for free at https://legacy.cnx.org/content/col11585/1.6
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