Across
- 2. membrane surrounding each lung
- 4. organs containing bronchial tree
- 6. opening to throat
- 7. one leads to left lung and one to the right lung
- 9. contains bronchi and bronchioles
- 12. stimulates diaphragm
- 15. first part of pharynx
- 18. cavity where air enters body
- 19. protect body from invaders
Down
- 1. contains nasal cavity
- 3. where gas exchange occurs
- 5. third part of pharynx
- 8. second part of pharynx
- 10. brings air to chest
- 11. muscle that expands thoracic cavity
- 13. covers windpipe during swallowing
- 14. warms and filters air
- 16. voice box
- 17. hairs in nose that filter debris