Question at position 29 The primary physiological function of synovial fluid within a joint is to:Anchor ligaments to bone surfacesStabilize the joint by increasing frictionLubricate the joint and nourish the articular cartilageProvide structural rigidity to the joint capsuleClear my selection

Question

BlackTom AI · Accepted Answer

Synovial fluid functions primarily as a lubricant and nutritive medium within synovial joints.

1. Relevant knowledge points and concepts
- Synovial joints are lined by a synovial membrane that secretes synovial fluid, which contains hyaluronic acid, lubricin, and plasma-derived components. Articular cartilage covering bone ends is avascular and receives nutrients by diffusion. Key functions attributed to synovial fluid include lubrication (reducing friction), shock absorption, and supplying nutrients/removing metabolic wastes for articular cartilage.

2. Complete reasoning process step by step
- Identify the properties of synovial fluid: viscous due to hyaluronic acid, contains proteins like lubricin that reduce shear forces.
- Recognize articular cartilage is avascular and depends on synovial fluid for nutrient exchange.
- Link lubrication and nutrient delivery to the phrase “lubricate the joint and nourish the articular cartilage,” which directly matches known physiological roles.

3. Calculations or intermediate steps
- No numerical calculations are required. Conceptual intermediate step: compression and decompression of cartilage during joint movement pumps synovial fluid in and out of cartilage matrix, enhancing diffusion of nutrients and waste.

4. Why the correct answer is correct
- Lubrication: hyaluronic acid and lubricin in synovial fluid lower friction between cartilage surfaces, allowing smooth motion. Nutrient role: because cartilage lacks blood vessels, synovial fluid provides oxygen and metabolites and removes waste through diffusion and cyclic pressure changes, maintaining cartilage health.

5. Why other options are incorrect
- "Anchor ligaments to bone surfaces": Ligaments attach to bone via fibrous connective tissue and periosteal fibers, not synovial fluid. 
- "Stabilize the joint by increasing friction": Increasing friction would impede movement; synovial fluid reduces friction to facilitate motion. Joint stability is mainly from ligaments, capsule, and muscles. 
- "Provide structural rigidity to the joint capsule": Structural rigidity comes from the fibrous capsule and surrounding ligaments, not the fluid inside.

6. Conclusion confirming final answer
- Therefore, the correct choice is "Lubricate the joint and nourish the articular cartilage," which matches the provided answer.

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