Biology / Unit 13 Bio 3107 short lesson, about 20 seconds
Synovial Joints and Synovial Fluid
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The idea
A synovial joint allows free movement between bones, cushioned by cartilage-capped bone ends and lubricated by synovial fluid inside a fibrous capsule.
In practice
The knee's synovial fluid reduces friction between cartilage surfaces during repeated bending.
Where people slip
Synovial fluid lubricates and nourishes joint cartilage — it is not merely a passive cushioning layer.
Your place on the trail
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