Which heart layer is the muscular middle layer?

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Multiple Choice

Which heart layer is the muscular middle layer?

Explanation:
The muscular middle layer is the myocardium. It’s made of cardiac muscle arranged in thick bundles that contract to pump blood, sitting between the inner lining (endocardium) and the outer surface (epicardium). The epicardium is the outer layer of the heart wall and is part of the serous pericardium, while the pericardium refers to the surrounding sac that encloses the heart. The endocardium lines the heart chambers and valves. Since this middle layer is responsible for the heart’s pumping action, it’s the muscular layer of the heart.

The muscular middle layer is the myocardium. It’s made of cardiac muscle arranged in thick bundles that contract to pump blood, sitting between the inner lining (endocardium) and the outer surface (epicardium). The epicardium is the outer layer of the heart wall and is part of the serous pericardium, while the pericardium refers to the surrounding sac that encloses the heart. The endocardium lines the heart chambers and valves. Since this middle layer is responsible for the heart’s pumping action, it’s the muscular layer of the heart.

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