The wall of the human heart is thick due to:

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(B) The human heart wall consists of three layers: the epicardium (outer),the myocardium (middle),and the endocardium (inner). The myocardium is compo

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Myocardium

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(B) The human heart wall consists of three layers: the epicardium (outer),the myocardium (middle),and the endocardium (inner). The myocardium is composed of cardiac muscle tissue,which is responsible for the contraction and relaxation of the heart. Because it contains thick layers of cardiac muscle,the myocardium is the thickest layer of the heart wall,providing the necessary strength for pumping blood throughout the body.

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