Antagonistic Muscles, Pair of muscles that act on a joint. One muscles contracts, the other one relaxes., Bone Marrow, Soft tissue found inside bones that produce new blood cells, Ligament, Tough material joining two bones together, Skeleton, The support structure for an organism, Cartilage, A smooth surface which cushions the joint, Tendon, Tough material joining a muscle to a bone, Tissue, A group of similar cells that carry out the same function.

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