Body systems

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Across
  1. 3. the muscle your heart is made of
  2. 5. system what system removes carbon dioxide from the body?
  3. 6. what is the main structure of the respiratory system?
  4. 7. a chemical compound produced by glands
Down
  1. 1. breaks down food you eat
  2. 2. removes excessive fluids and waste from the blood?
  3. 4. What is the muscular system made up of?