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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