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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.
A small amount of pleural fluid found in the thoracic cavity serves as a lubricant, reducing friction as the tissues rub against each other. Pleura are thin layers of smooth epithelium that make up the pleural tissue that lines the inner surface of the walls of the chest. The two layers of the pleura are in c â¦ ontact and slide over one another as the lungs expand and contract.