Across
- 3. 2 narrow tubes
- 6. main organs
- 8. reduces space around lungs
- 9. held open by C-shaped rings
- 11. the movement of air into and out of the lungs
Down
- 1. a triangle shaped area
- 2. lines the nose
- 4. air is warmed and moistened
- 5. microscopic sacs
- 7. moves air in and out of lungs
- 10. a tubelike passageway