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Endocardium
innermost layer of tissue that lines the heart / From Wikipedia, the free encyclopedia
The Endocardium is the innermost layer of tissue which lines the inside of the heart. It plays a role in controlling the function of the myocardium, the heart muscle. The endocardium is made of simple epithelial cells similar to those which line blood vessels.
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In addition to lining the inside of the heart, the endocardium also regulates heart contractions and aids cardiac embryo development.