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External and internal organ of heart​ ?
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External and internal organ of heart​ ?

User ThePengwin
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The heart wall consists of 3 layers:
Epicardium: thin external layer formed by visceral layer of serous pericardium
Myocardium: thick middle layer made of cardiac muscle
Endocardium: thin internal membrane that lines the heart and its valves. It is composed of endothelium and sub-endothelial connective tissue, similar to intimal component of blood vessels.
User Ashu Kumar
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Answer:

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User Sushank Pokharel
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