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a movement in which the body part bends and there is a decrease in the angle between the articulating bones e.g. raising the arm at the elbow.
the opposite of flexion: the angle between the articulating bones increases and the body part straightens e.g. straightening the leg at the knee.
movement away from the midline of the body e.g. raising the arm from the shoulder so that it moves away form the body.
movement towards the midline of the body e.g. lowering the arm from the shoulder so that it moves towards the body.
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