What does extension refer to in joint movement?

Extension in joint movement refers to the action of increasing the angle between two body parts, typically at a joint. For example, when you straighten your elbow or knee, you are performing an extension. This movement contrasts with flexion, which is the action of decreasing the angle of a joint, thereby bringing the body parts closer together.

Understanding the specific mechanics of joint movement is essential in various fields, including medicine and physical therapy, as it helps professionals assess the range of motion and function of different joints in the body. Recognizing that extension involves an increase in angle clarifies its role in the overall movement of the bodily systems.