Respiratory System

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Across
  1. 5. toxic and odourless gas
  2. 6. horizontally elongated feature of the face
  3. 9. 2 airways to the lungs
  4. 11. study of the respiratory system
  5. 12. voluntary action of inhaling a harmful substance
  6. 14. tube parallel to the trachea
  7. 15. adjective of nose
  8. 16. Flying mammal
  9. 21. largest organ in the respiratory system
  10. 22. infection of the lungs
  11. 23. windpipe after the pharynx
  12. 24. small air sacs that exchange carbon monoxide and oxygen
  13. 25. Man's best friend
Down
  1. 1. Has a trunk
  2. 2. action of releasing air from the respiratory system
  3. 3. sharp and loud expel of air from the lungs
  4. 4. an overnight test of the respiratory
  5. 7. valve preventing food or air
  6. 8. grippe
  7. 10. mucus
  8. 13. Large marsupial
  9. 17. abbreviation of an underwater breathing machine
  10. 18. caused by excessive amounts of phlegm
  11. 19. Bronchial allergy to proteins
  12. 20. Likes to chase mice