The Respiratory System

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Across
  1. 2. small air tubes
  2. 3. a muscle that inflates and deflates the lungs
  3. 5. Protects the organ
  4. 7. air sacs
  5. 9. splits air into each lung
  6. 10. changes the structure of the lungs
  7. 12. Where air enters the body
Down
  1. 1. waste gas
  2. 4. It is the pipe that sends air into the lungs
  3. 6. the process whereby gases move from high to low
  4. 8. The air we breath
  5. 11. It is the organ that collects the air