Cardiac muscle forming the heart wall.

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Multiple Choice

Cardiac muscle forming the heart wall.

The heart wall’s muscular layer is the myocardium. This cardiac muscle tissue is responsible for the heart’s pumping action, contracting in a coordinated way to push blood through the chambers and into circulation. The myocardium sits between the inner lining, the endocardium, and the outer layer, the epicardium (which is the outer surface of the heart). The aorta is a major artery, not a layer of the heart wall, so it isn’t the muscular foundation of the heart. The endocardium lines the chambers and valves, while the epicardium covers the heart’s exterior.

The heart wall’s muscular layer is the myocardium. This cardiac muscle tissue is responsible for the heart’s pumping action, contracting in a coordinated way to push blood through the chambers and into circulation. The myocardium sits between the inner lining, the endocardium, and the outer layer, the epicardium (which is the outer surface of the heart). The aorta is a major artery, not a layer of the heart wall, so it isn’t the muscular foundation of the heart. The endocardium lines the chambers and valves, while the epicardium covers the heart’s exterior.

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