Skeletal System protects the 1. internal organs and 2. gives support to the body.Skeletal System provides 3. structure for muscles to do work whether it is skeletal.Digestive System provides 4. nutrients and 5. water that muscle cells need to do work.Respiratory System provides 6. oxygen and removes 7. carbon dioxide that muscle cells produce as a waste product.Circulatory System moves oxygen and glucose around the body so cells can do work. It removes 8. waste products from the body.Muscular System provides 9. movement and 10. protection for internal organs.Nervous System delivers 11. messages from the brain to the rest of the body. The 12. spinal cord delivers 13. brain impulses from the brain to the rest of the body.