The Respiratory System

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Across
  1. 5. The air we breathe
  2. 6. Alternates the structure of the lungs.
  3. 9. The organ used to inhale
  4. 11. The muscle that inflates and deflates the lungs
  5. 12. waste gas
Down
  1. 1. Small air tubes
  2. 2. Sacs of air
  3. 3. The organs that work together to help you breathe
  4. 4. The pipe that send air into the bronchioles
  5. 7. Splits air into each lung
  6. 8. Protects the organs.
  7. 10. The process that moves gases from high to low