skeleton - structure which supports animals body, exoskeleton - skeleton on the outside the body, joints - place where two bones meet, hinge joints - a joint at which one bone can move in one plane in relation to the other., ball socket joints - a joint can which one bone can move in a circular motion., muscles - organs made up of specialised muscle cells, which can make themselves shorter (contracts), contraction - getting shorter, tendons - strong, non-stretchy cords that attach muscles to bones, biceps - a muscle attached to the scapula and radius, bend the elbow joints when it contracts, triceps - a muscle attached to the scapula and ulna, straighten the elbow joints when it contracts., relax - stop contracting, antagonistic muscle - a pair of muscle work together to cause opposite movements at a joints when they contract.,

Skeletal System

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