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The muscle walls of the heart are called the:
Suggested Answer: A
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The muscle walls of the heart are called the myocardium. This is the thick, muscular layer of the heart responsible for contracting and pumping blood throughout the body. The myocardium is composed of specialized cardiac muscle cells that enable the heart to function as an efficient pump. It is distinct from the endocardium (inner lining) and the epicardium (outer layer) of the heart.
Guyton and Hall Textbook of Medical Physiology
Cardiovascular Physiology by Mohrman and Heller
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