The function of a bursa is to?

• A. Protect joints from impact
• B. Attach muscles to bone
• C. Store calcium
• D. Hold synovial fluid

Answer: (D)

Bursae are tiny, fluid-filled sacs that provide lubrication and a cushion around joints. Their main job is to hold synovial fluid, creating a slick surface that reduces friction between moving structures such as bones, tendons, and muscles as you move. This lubrication helps prevent irritation and wear from repetitive motion. Calcium storage happens in bone, not in bursae; attaching muscles to bone is the role of tendons; and protection from impact is mainly provided by cartilage and bone surfaces. So, holding synovial fluid to cushion and lubricate is the primary function of a bursa.