Across
- 5. what you breathe in
- 6. voicebox
- 8. muscle of the respiratory system
- 9. where you first breathe in air
- 11. tiny hair-like structures that line the nasal cavity
- 12. throat
- 13. windpipe
Down
- 1. what you breathe out
- 2. tiny sacs where gas exchange occurs
- 3. flap that covers the trachea when you swallow food
- 4. pair of passages that connect the trachea to the bronchioles
- 7. tiny branches that connect the bronchi to the alveoli
- 10. major organ of the respiratory system