respiratory system crossword

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Across
  1. 6. the blood in the nose adds this to the air
  2. 10. artery leading to lungs
  3. 12. divides nasal cavity; increases the surface area of the nose
  4. 13. chamber at the back of the throat
  5. 14. chemical in blood that carries oxygen
  6. 16. mucus adds this to the air
  7. 18. connects to ears and nose at the pharynx
  8. 19. gas that effects your rate of breathing
  9. 20. 2/3. you normally use this much of your lungs
  10. 22. keeps food out of lungs
  11. 24. air sacs of the lung
Down
  1. 1. in order to speak you must do this
  2. 2. food used in respiration
  3. 3. the muscle involved in breathing
  4. 4. moves mucus back up the mouth
  5. 5. before you inhale, the diaphragm must move in this direction
  6. 6. maintaining constant internal environment
  7. 7. what you breath
  8. 8. what you should breathe through
  9. 9. windpipe
  10. 10. refers to the lung
  11. 11. when the traches branches it becomes these
  12. 15. part of the brain that controls breathing
  13. 17. produces mucus
  14. 21. bones involved in breathing
  15. 23. voice box