Hinge and pivot joints are examples of which type of joints?

Hinge and pivot joints are classified as uniaxial joints because they allow movement primarily around a single axis. In a hinge joint, such as the elbow or knee, movement occurs in one direction, similar to the motion of a door hinge—flexion and extension. This single-plane movement is characteristic of uniaxial joints.

Pivot joints, like the atlantoaxial joint in the neck, permit rotational movement around a longitudinal axis. Again, this type of movement is restricted to one plane, confirming the uniaxial classification.

In contrast, other types of joints allow for more complex movements that encompass multiple axes. Biaxial joints permit movement in two planes, like the wrist, while triaxial joints, such as the shoulder, allow movement in three planes. Thus, hinge and pivot joints' restricted movement aligns them with the uniaxial category specifically.