What is the muscle of the heart?

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Multiple Choice

What is the muscle of the heart?

The muscle of the heart is the myocardium—the thick muscular middle layer that contracts to pump blood. The atria are the two upper chambers that receive blood; the endocardium is the smooth inner lining of the chambers and valves; the epicardium is the outer layer covering the heart. The myocardium is composed of cardiac muscle tissue connected by intercalated discs, which allows the heart to beat in a coordinated, rhythmic manner.

The muscle of the heart is the myocardium—the thick muscular middle layer that contracts to pump blood. The atria are the two upper chambers that receive blood; the endocardium is the smooth inner lining of the chambers and valves; the epicardium is the outer layer covering the heart. The myocardium is composed of cardiac muscle tissue connected by intercalated discs, which allows the heart to beat in a coordinated, rhythmic manner.

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