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  3. Unit 4: fluids and transport
  4. The cardiovascular system: the
  5. Heart anatomy

19.1 Heart anatomy  (Page 19/86)

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19 / 86  The ________ layer secretes chemicals that help to regulate ionic environments and strength of contraction and serve as powerful vasoconstrictors.
A  pericardial sac
B  endocardium
C  myocardium
D  epicardium
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Practice MCQ 7 FlashCards 2 Key Terms 63

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Source:  OpenStax, Anatomy & Physiology. OpenStax CNX. Feb 04, 2016 Download for free at http://legacy.cnx.org/content/col11496/1.8
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