The document discusses the skeletal system and muscular system of the human body. It describes that adults have 206 bones that come in different shapes and sizes, including the skull, backbone, ribs, shoulders, arms, legs, and feet. The skeletal system provides structure, movement, protection, blood cell production, storage, and endocrine regulation. Common bone diseases include osteoporosis, dislocations, scoliosis, and arthritis. There are three types of muscles - smooth, cardiac, and skeletal. Common muscle disorders involve sprains, strains, cramps, muscular dystrophy, tendinitis, and myositis.
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