Final answer:
Abduction moves away from the midline, while adduction moves towards it. Circumduction involves circular motion.
Explanation:
Abduction occurs when a bone moves away from the midline of the body. For example, moving the arms or legs laterally to lift them straight out to the side is an instance of abduction. On the other hand, adduction is the movement of a bone toward the midline of the body. When the limbs move inward after abduction, it is an example of adduction. Circumduction refers to the movement of a limb in a circular motion, such as swinging an arm around.
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