What is the definition of extension in terms of body movement?

The definition of extension in terms of body movement refers specifically to the straightening of a body part, often at a joint. This movement increases the angle between the body parts involved, effectively returning a limb to its anatomical position from a bent position. For example, when you straighten your arm after bending it at the elbow, you are performing an extension.

In this context, bending a limb describes flexion, as it involves decreasing the angle between two body parts. Twisting a joint and rotating a limb involve movements related to rotation rather than straightening. Thus, identifying extension accurately as straightening a body part is essential for understanding basic body movements relevant to nursing and physical therapy practices.