What does the term "flexion" refer to in movement?

The term "flexion" specifically describes a bending motion that decreases the angle between two parts of the body. This is commonly seen in joints such as the elbow or knee, where, for example, lifting a hand toward the shoulder involves flexion of the elbow. The primary characteristic of flexion is its action of bringing two body segments closer together, which is essential for various activities and movements in everyday life. Understanding this term is fundamental in fields such as anatomy, kinesiology, and physical therapy, where precise language about movement is crucial for effective communication and treatment.