Across
- 2. muscle that inflates/deflates the lungs
- 4. what you breathe out
- 7. connect the bronchus to the alveoli
- 8. pipe that sends air to the lungs
- 10. you inhale with your...
- 11. small thin blood vessels
Down
- 1. a chemical reaction
- 3. organ that collects air
- 5. what you breathe in
- 6. exchanges oxygen and CO2 in the blood
- 7. splits air into each lung
- 9. bones surrounding the lungs and heart