What is the role of cartilage in joints?

• A. Friction reduction and cushioning
• B. Blood cell production
• C. Movement only
• D. Calcium storage

Answer: (A)

The main idea is that cartilage in joints provides a smooth, low-friction surface and acts as a cushion during movement. In a joint, the ends of the bones are covered with articular cartilage, which slides so bones can move with minimal resistance. Its hydrated, resilient matrix helps absorb shocks and distribute loads across the joint, protecting the bones from wear and tear during activities.

Cartilage is avascular, meaning it lacks its own blood supply, so it relies on surrounding joint fluid and regular movement to nourish its cells and stay healthy.

Blood cell production happens in bone marrow, not cartilage. Movement isn’t caused by cartilage but is enabled by muscles and joints working together; cartilage makes movement smoother by reducing friction. Calcium storage occurs in bone, not cartilage.