Final answer:
Abduction involves moving a body part away from the midline of the body, while adduction brings it back toward the midline. Circumduction is the circular movement of a limb.
Step-by-step explanation:
Abduction occurs when a bone moves away from the midline of the body. Examples of abduction are moving the arms or legs laterally to lift them straight out to the side.
Adduction is the movement of a bone toward the midline of the body. Movement of the limbs inward after abduction is an example of adduction. Circumduction is the movement of a limb in a circular motion, as in moving the arm in a circular motion.