Which joints cannot move?

• A. Non-synovial joints
• B. Synovial joints
• C. Ball-and-socket joints
• D. Pivot joints

Answer: (A)

The question tests understanding of how joints differ in movement. Non-synovial joints lack a synovial cavity and are connected by fibrous tissue or cartilage, which provides stability with little to no movement. Because of this structure, they are effectively immovable. In contrast, synovial joints have a synovial cavity, a capsule, and fluid that allow movement, with various types like ball-and-socket and pivot enabling wide ranges of motion or rotation. So the joints that cannot move are the non-synovial ones, since their design prioritizes stability over mobility. The other options refer to joints that are capable of movement, so they are not correct for “cannot move.”