What is defined as bending a limb at a joint?

Flexion is defined as the action of bending a limb at a joint, which decreases the angle between the two parts of the limb. For example, when you bend your arm at the elbow, you are performing flexion. This movement is essential for many daily activities, allowing for greater range of motion and the ability to manipulate objects.

The other terms refer to different types of movements: extension involves straightening a limb to increase the angle at a joint, adduction refers to moving a limb toward the body's midline, and rotation describes the circular movement around an axis. These clarify that flexion specifically relates to the bending action, distinguishing it from other movements.