A thin membrane consisting of ﬂat endothelial cells; it lines the four chambers of the HEART and is continuous with the lining of arteries and veins. The endocardium has a smooth surface which helps the blood to ﬂow easily. The valves at the openings of the heart’s chambers are made from folded-up membranes. Inﬂammation of the endocardium is called ENDOCARDITIS.
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