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Actually, the heart is surrounded by a pericardium and its wall is made of 3 layers. Therefore, the terminology "4 walls of the human heart" is quite misleading.

So, from outside to inside, we have:

*Pericardium

*Heart wall:

-Epicardium

-Myocardium

-Endocardium

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11y ago
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Q: What are the 4 walls of the human heart?
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