What type of movement decreases the angle between two body parts?

Flexion is the type of movement that decreases the angle between two body parts, typically occurring at a joint. For example, when you bend your elbow, the angle between the forearm and the upper arm decreases, demonstrating flexion. This action moves the body parts closer together.

In contrast, extension increases the angle between body parts, as seen when straightening the elbow. Adduction refers to the movement of a body part toward the midline of the body, while abduction moves it away from the midline. Both adduction and abduction do not primarily involve the reduction of an angle between joints, therefore, they are not applicable to the question regarding the angle.