Across
- 2. windpipe
- 4. chemical additive in tobacco
- 9. the system that includes all organs that help you breathe
- 10. large flat muscle under your lungs
- 11. infection of the lungs and alveoli
- 12. disease which destroys alveoli, caused by smoking
Down
- 1. major tubes leading to the lungs
- 3. increases lung capacity
- 5. tiny hairs in the nasal passage that remove dirt
- 6. chemicals in cigarettes that leave a black film on your lungs
- 7. a common respiratory ailment
- 8. tiny branches of lungs that carry oxygen to alveoli