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What does the term "adduction" refer to?

  1. Bending the body part

  2. Movement toward the midline of the body

  3. Turning the joint inward

  4. Touching an opposite finger with the thumb

The correct answer is: Movement toward the midline of the body

Adduction refers to the movement of a body part toward the midline of the body. This movement is in the opposite direction of abduction, which is the movement away from the midline. Option A is incorrect because bending a body part can refer to flexion or extension, depending on the joint. Option C is incorrect because turning a joint inward is known as medial rotation. Option D is incorrect because touching an opposite finger with the thumb is a specific movement known as opposition.