Joints come in two types: _________.

• A. Movable and immovable
• B. Elastic and rigid
• C. Smooth and rounded
• D. Flexible and fixed

Answer: (A)

Joints are classified by how much they allow movement. Some joints stay fixed and provide stability, while others are built to move, enabling bending, twisting, and swinging. The immovable joints, called synarthroses, keep bones tightly together with no motion. The movable joints, called diarthroses, have the structures that allow a wide range of motion, like the knee, elbow, or shoulder. That mobility-based distinction is what this question is testing. The other descriptions describe texture or rigidity rather than whether movement is possible.