Which substance lubricates a synovial joint?

Which substance lubricates a synovial joint?

• A. Hyaline cartilage
• B. Synovial fluid
• C. Tendons
• D. Bone

Answer: (B)

In a synovial joint, lubrication comes from synovial fluid. This slippery fluid is produced by the synovial membrane and fills the joint cavity, allowing the articulating cartilage surfaces to glide smoothly with minimal friction during movement. It also helps nourish the cartilage and absorb shocks. Hyaline cartilage is the smooth tissue covering bone ends, tendons connect muscle to bone, and bone is the rigid framework—none of these act as the lubricating film.

In a synovial joint, lubrication comes from synovial fluid. This slippery fluid is produced by the synovial membrane and fills the joint cavity, allowing the articulating cartilage surfaces to glide smoothly with minimal friction during movement. It also helps nourish the cartilage and absorb shocks. Hyaline cartilage is the smooth tissue covering bone ends, tendons connect muscle to bone, and bone is the rigid framework—none of these act as the lubricating film.