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shock absorption - as a dilatant fluid, that possesses rheopectic properties, becoming more viscous under applied pressure the synovial fluid in diarthrotic joints becomes thick the moment shear is applied in order to protect the joint and subsequently, thins to normal viscosity instantaneously to resume its lubricating function between shocks.
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reduction of friction - synovial fluid lubricates the articulating joints.The functions of the synovial fluid include: During movement, the synovial fluid held in the cartilage is squeezed out mechanically to maintain a layer of fluid on the cartilage surface (so-called weeping lubrication). The fluid in articular cartilage effectively serves as a synovial fluid reserve. This fluid forms a thin layer (roughly 50 μm) at the surface of cartilage and also seeps into microcavities and irregularities in the articular cartilage surface, filling all empty space. The fluid contains hyaluronan secreted by fibroblast-like cells in the synovial membrane, lubricin (proteoglycan 4 PRG4) secreted by the surface chondrocytes of the articular cartilage and interstitial fluid filtered from the blood plasma. Produced by cells within the joint tissues. Synovial fluid is an ultrafiltrate from plasma, and contains proteins derived from the blood plasma and proteins that are The inner membrane of synovial joints is called the synovial membrane and secretes synovial fluid into the joint cavity.