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Created page with "== Anatomy and Structure == The myocardium is the middle layer of the heart wall and is composed of cardiac muscle tissue. This layer is responsible for the heart's ability to contract and thus pump blood throughout the body. The myocardium is sandwiched between two protective layers: the epicardium on the outside and the endocardium on the inside read more. The cardiac muscle cells, or cardiomyocytes, that make up the myocardium are unique in their stru..."