NETA Personal Trainer Practice Exam

What is the definition of flexion in joint movement?

1. A movement that increases the relative joint angle

2. A movement that decreases the relative joint angle

3. A movement parallel to the ground

4. A movement that rotates around an axis

The correct answer is: A movement that decreases the relative joint angle

Flexion refers to a movement that decreases the relative angle between two body parts at a joint. When flexion occurs, such as in bending the elbow or knee, the angle between the bones forming the joint becomes smaller. This is a fundamental movement pattern in many physical activities and is essential for various exercises. In contrast, the other definitions provided refer to different types of movements. The option that mentions increasing the joint angle describes extension, which is the opposite of flexion. Movements that are parallel to the ground relate to horizontal movements rather than angular changes in the joints, and rotation around an axis pertains to circular movements rather than the angle changes involved in flexion and extension. Thus, focusing on the decrease of the angle accurately captures the essence of flexion in joint movement.