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                                    Epicardium of heart | 
                            
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Answer»  ong>Explanation: The epicardium is a THIN layer of elastic CONNECTIVE tissue and fat that serves as an additional layer of protection from trauma or FRICTION for the HEART under the pericardium. This layer contains the coronary blood vessels, which oxygenate the TISSUES of the heart with a blood supply from the coronary arteries.  | 
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