Which joint type produces synovial fluid and has a joint cavity?

• A. Non-synovial joint
• B. Cartilaginous joint
• C. Fibrous joint
• D. Synovial joint

Answer: (D)

A joint that produces synovial fluid and has a joint cavity is the synovial joint. This type features a capsule enclosing a space called the joint cavity, lined by a synovial membrane that secretes synovial fluid. The fluid lubricates the joint, reduces friction, and nourishes the articular cartilage, supporting smooth, wide-ranging movement. That combination—a cavity with fluid produced inside the joint—is what sets synovial joints apart. Other joint types lack a cavity and do not produce synovial fluid; fibrous joints are bound by dense tissue and are mostly immovable, and cartilaginous joints are joined by cartilage with limited movement. So the description points to the synovial joint, like those at the knee, shoulder, or elbow.