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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.
The membranes help make the heart's surface smooth and acts as a cushion so that the bones of the rib cage don't damage the heart when it contracts. The pericardial fluid between the layers of the visceral pericardium lubricate the heart as it contracts so the fibers of the heart don't wear out.