Across
- 5. Outer layer of the lungs
- 7. Process of breathing in
- 9. Smaller airways inside the lungs
- 11. Protects the lungs and heart
- 12. Tubes branching from the trachea
- 13. Structure dividing the nose into two passages
Down
- 1. Gas taken in during inhalation
- 2. Hair like structures that trap particles in the airways
- 3. Tiny air sacs where gas exchange occurs
- 4. Gas expelled during exhalation
- 6. Windpipe that carries air to the lungs
- 8. Primary muscle for breathing
- 10. The voice box