The Heart

The human heart is located in the left side of the mediastinum, and it has 3 layers. The epicardium, the myocardium, and the endocardium. The epicardium is the outermost layer, the myocardium is the middle layer, and the endocardium is the innermost layer and it lines the inner chambers and heart valves. The contracting muscle of the heart is the myocardium.

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