Respiratory System

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Across
  1. 3. / Collapsed lung.
  2. 4. / Divides left and right nostrils.
  3. 6. / Voice box.
  4. 7. / Pause in breathing during sleep.
  5. 9. / Spasm of the diaphragm.
  6. 10. / Lack of oxygen in tissues.
  7. 13. / Muscle used for breathing.
  8. 16. / Cavity where lungs are.
  9. 17. / Spaces within the skull bones.
Down
  1. 1. / Bones that divide the nasal cavity.
  2. 2. / Tubes from trachea to lungs.
  3. 5. / Windpipe.
  4. 8. / Respiratory center of the brain.
  5. 11. / Whooping cough.
  6. 12. / Air sacs.
  7. 14. / Space at the back.
  8. 15. / Opening with vocal cords.
  9. 18. / Fluid build-up in air sacs, caused by altitude sickness.