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Wikipedia definition
1. Pericardial fluidSurrounding the heart is a sac known as the pericardium, which consists of two membranes. The outer layer being the fibrous parietal pericardium and the inner layer being the serous visceral pericardium. It is the serous visceral pericardium that secretes the pericardial fluid into the pericardial cavity, (the space between the two pericardial layers). It is similar to the serous fluid that is found in the brain for cushioning and ability to move semi-freely.
Read “Pericardial fluid” on English Wikipedia
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Read “Pericardial fluid” on DBpedia

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