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,

Human Skeleton

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