Question: 6. 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

6. 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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