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Structures – bones made of living cells, protein fibers and calcium . Functions: 1. Supports the body 2. Protects internal organs 3. Allows movement 4. Stores minerals 5. Makes blood cells Structure – 3 types of muscle tissue: 1. Skeletal muscle – attached to bone 2. Smooth muscle – not under voluntary control (lining of stomach, blood vessels) 3. Cardiac muscle – makes up the heart. Function – to provide forces for movement - muscles attached to bones by tendons - muscle contractions move bones (uses ATP for energy ) Arthritis – inflammation of joints Muscular Dystrophy - inherited disorder causing weakening and wasting away of muscles.