Which is the muscular layer of the heart?

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Multiple Choice

Which is the muscular layer of the heart?

Explanation:
The muscular layer of the heart is the myocardium. It’s the thick middle layer made of cardiac muscle that contracts to pump blood. The endocardium is the smooth inner lining of the chambers and valves, and the epicardium is the outer surface that covers the heart and includes part of the pericardium. The atria are the heart’s upper chambers, not a muscular layer. So the layer that does the pumping force is the myocardium.

The muscular layer of the heart is the myocardium. It’s the thick middle layer made of cardiac muscle that contracts to pump blood. The endocardium is the smooth inner lining of the chambers and valves, and the epicardium is the outer surface that covers the heart and includes part of the pericardium. The atria are the heart’s upper chambers, not a muscular layer. So the layer that does the pumping force is the myocardium.

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