Joints are areas where two bones fit together. There are special kinds of joints, and some of them move. Our fingers, toes, elbows and knees are all hinge joints. Hinge joints allow bones to move back and forth in one direction. Our shoulders and hips are examples of ball and socket joints. In our shoulders, one bone has a rounded end that fits into the other bone. Ball and socket joints allow the bones to move around more freely than hinge joints. Our wrists and ankles are examples of gliding joints. In a gliding joint, one part of a bone slides over another bone.

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