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1.6 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, 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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