Across
- 4. exchange center of gases
- 6. gas we breathe in
- 8. dioxide gas we breathe out
Down
- 1. trachea divides into two___________
- 2. air enters our body through___________
- 3. the other name of windpipe___________
- 5. when we exhale, our lungs__________
- 7. when we inhale, our lungs__________
- 9. it carries oxygen to different cells of the body