respiratory system

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Across
  1. 2. the movement that brings in and takes out air
  2. 4. what we breath in for the cellular respiration
  3. 7. when air goes in
  4. 10. waste material of cellular respiration
  5. 11. two opening in your nose
  6. 13. the tube that connects the throat and bronchi
  7. 15. the many little branches of bronchi
  8. 17. small blood tubes surrounding the alveoli
  9. 18. two tubes that enter lungs
Down
  1. 1. a membrane that can close trachea
  2. 3. grapelike sacs in the lungs
  3. 5. when air goes out
  4. 6. a sticky substance of the respiratory system
  5. 8. muscle that controls size of chest cavity
  6. 9. the tiny hairs that clean the air
  7. 12. another name for the voicebox
  8. 14. a sac containing the lung
  9. 16. two large lightweight organs