Flexion is best defined as what?

Flexion is defined as the act of bending or angulating a body part, which reduces the angle between that body part and another part or the body as a whole. This movement typically occurs at joints, such as the elbow or knee, where the limb moves closer to the body.

In the context of anatomical movements, flexion is a specific type of motion distinguished from extension, which is the opposite movement that increases the angle between body parts. Therefore, when you think of flexion, envision actions like bending your arm or leg, where the joint allows for the reduction of the angle.

The other options represent different types of movements that do not accurately describe flexion. For example, one option refers to extension, which moves body parts apart; another option relates to spreading motion, which is akin to abduction; and the last option describes twisting, which is known as rotation. Each of these movements has a distinct biomechanical definition that sets it apart from flexion.