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Heart
...  and is filled with special pericardial fluid ensuring smooth heart movements in a state of suspension within the sac. There are also three special layers creating the outer wall of the heart. It is epicardium also called the visceral pericardium. It creates the outermost layer of the heart wall. The myocardium, thick layer of muscle squeezed as the heart beats, is the middle layer of the heart  ...


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