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Wikipedia definition
1. EndocardiumThe endocardium is the innermost layer of tissue that lines the chambers of the heart. Its cells are embryologically and biologically similar to the endothelial cells that line blood vessels. The endocardium underlies the much more voluminous myocardium, the muscular tissue responsible for the contraction of the heart. The outer layer of the heart is termed epicardium and the heart is surrounded by a small amount of fluid enclosed by a fibrous sac called the pericardium.
Read “Endocardium” on English Wikipedia
Read “心内膜” on Japanese Wikipedia
Read “Endocardium” on DBpedia

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