Synovial Joints and Synovial Fluid
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A synovial joint allows free movement between bones, cushioned by cartilage-capped bone ends and lubricated by synovial fluid inside a fibrous capsule.
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The knee's synovial fluid reduces friction between cartilage surfaces during repeated bending.
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Synovial fluid lubricates and nourishes joint cartilage — it is not merely a passive cushioning layer.