Respiratory system

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Across
  1. 3. space at the back of the oral cavity
  2. 8. disease caused by smoking
  3. 11. cavity where lungs sit
  4. 12. required for cellular respiration
  5. 13. inflammation of air passages
  6. 16. bones of the nasal cavity
  7. 17. test that measures air volume
  8. 18. collapsed lung
  9. 19. tubes from trachea to lungs
  10. 20. muscle used for breathing
  11. 21. divides left and right nostrils
  12. 23. air sacs
  13. 24. voice box
Down
  1. 1. whooping cough
  2. 2. pause in breathing during sleep
  3. 4. spasm of the diaphragm
  4. 5. build up of fluid
  5. 6. windpipe
  6. 7. opening with vocal cords
  7. 8. prevents food from entering the airway
  8. 9. spaces within the skull bones
  9. 10. where cellular respiration takes place
  10. 14. lack of oxygen in tissues
  11. 15. keeps alveoli from collapsing
  12. 22. respiratory center of the brain