Across
- 6. tissue that lines the airways
- 9. specialized cells that produce mucus
- 10. air enters and is filtered
- 11. voice box, contains vocal cords
- 13. muscle that controls breathing
Down
- 1. gas ___ is a major function
- 2. tubes that carry air into the lungs
- 3. distributes air in the lungs
- 4. cells with tiny hair-like structures
- 5. tiny air sacs in the lungs
- 7. spongy organs used in breathing
- 8. ___ production is also a function
- 12. tube that transports air
- 14. passageway for air, throat