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  3. Unit 7. animal structure and
  4. The circulatory system
  5. Mammalian heart and blood vessels

40.3 Mammalian heart and blood vessels  (Page 6/41)

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6 / 41  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 4 FlashCards 2 Key Terms 31

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Source:  OpenStax, Biology. OpenStax CNX. Feb 29, 2016 Download for free at http://cnx.org/content/col11448/1.10
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