Across
- 3. skeletal mussel
- 4. flap of tissue
- 6. behided your nose and mouth
- 8. dioxide exhale
- 10. Divides in branches
- 11. air sacks for your longs
- 12. a blood vessel
Down
- 1. a long tube that connects to your voice box
- 2. skull around cheeks and forehead
- 5. tree the trachea in two primarily branches
- 7. action of breathing
- 9. chemical reaction blood cell