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Function [edit]. The pericardial fluid reduces friction within the pericardium by lubricating the epicardial surface allowing the membranes to glide over each other with each heart beat.
Aug 22, 2016. The membrane that covers the heart is called Pericardium. Pericardium is a thin, double layered membrane that protects the heart from external blows and injuries. There is a fluid called pericardial fluid present in between the membranes. Its function is also to protect the heart.