Write short note on the general structure of heart wall

The heart wall of vertebrates is composed of three distinct layers: the epicardium, myocardium, and endocardium. Each layer has specific functions, and together they form the structure necessary for efficient blood circulation.

The epicardium is the outermost layer of the heart wall. It is a thin, serous membrane composed of connective tissue __________ ______ _________ ________ ___ ______ __________.
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