Across
- 4. Very thin tubes
- 5. Thin-walled outpouching duct
- 11. Air-filled spaces within the nasal cavity
- 12. Exhalation
- 14. Microscopic air sacs
- 17. Arise from the trachea at fifth thoracic vertebra
Down
- 1. Opening between vocal cord
- 2. Branched airways leading from the trachea to air sacs
- 3. Hollow space behind the nose
- 6. Windpipe
- 7. Composed of bone and cartilage
- 8. Bones and bone processes that curl out from lateral walls
- 9. Soft, spongy, cone-shaped organ
- 10. Throat
- 13. Inhalation
- 15. Enlargement in the airway at the top of the trachea
- 16. Internal bone and cartilage support