The endocardium is continuous with the lining of the blood vessels which is called the endothelium.
Endocardium is the innermost layer of the heart's wall. It is made up of endothelial cells which offer a smooth, elastic, non-adherent surface for the collection as well as pumping of blood.
The endocardium may control metabolic waste expulsion from heart tissues and serve as a blockade between the blood and the heart muscle, thereby, regulating the constitution of the extracellular fluid (in which the cardiomyocytes bathe).
This tissue also covers the valves of the heart and is histologically continuous with the vascular endothelium of the important blood vessels entering as well as leaving the heart.
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