What is the middle layer of the heart?

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Multiple Choice

What is the middle layer of the heart?

Explanation:
The middle layer of the heart wall is the myocardium. It is the thick, muscular layer made of cardiac muscle that contracts to pump blood. The inner lining is the endocardium, which coats the chambers and valves, while the outer surface is the epicardium (the visceral layer of the pericardium). The pericardium itself encases the heart as a protective sac that reduces friction during each beat. The myocardium is especially thick in the left ventricle because it must generate the force to propel blood into the systemic circulation.

The middle layer of the heart wall is the myocardium. It is the thick, muscular layer made of cardiac muscle that contracts to pump blood. The inner lining is the endocardium, which coats the chambers and valves, while the outer surface is the epicardium (the visceral layer of the pericardium). The pericardium itself encases the heart as a protective sac that reduces friction during each beat. The myocardium is especially thick in the left ventricle because it must generate the force to propel blood into the systemic circulation.

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