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This layer of the heart wall consists mostly of the cardiac muscle and is the thickest and middle layer of the heart wall?

User Lode
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2 Answers

4 votes

Answer: Myocardium

Explanation: I go to college for nursing and already took this class so I know

User Thegeek
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5 votes

Myocardium

This layer surrounds and protects the heart.

User Fred Lackey
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