Synovial fluid as a lubricant.
D000818:Animals; D002358:Cartilage, Articular / Q000502:physiology; D006493:Heparin / Q000494:pharmacology; D006801:Humans; D007596:Joints / Q000502:physiology*; D008153:Lubrication; D009077:Mucins / Q000502:physiology; D013582:Synovial Fluid / Q000502:physiology*
D009077:Mucins; D006493:Heparin