What is the muscle of the heart?

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Prepare for the NREMT AEMT Test. Study with flashcards and multiple-choice questions. Each question includes hints and explanations. Get ready for your exam now!

Multiple Choice

What is the muscle of the heart?

Explanation:
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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