Final answer:
Flexion is a movement that involves anterior bending of the body or limbs. It occurs in the sagittal plane and is important for various joints in the body.
Step-by-step explanation:
Flexion is a movement that occurs within the sagittal plane and involves an anterior bending of the body or limbs. In the vertebral column, flexion refers to an anterior bending of the neck or trunk. For example, when you bend your neck forward to look down, you are performing flexion. Another example is bending your knee to bring your foot toward your posterior thigh, which is knee flexion. Flexion and extension are important movements that occur at various joints in the body.