Across
- 2. The alveoli have _______ linings.
- 7. The reaction that we call burning.
- 8. Where gas exchange takes place.
- 10. The gas produced by respiration.
- 11. The muscle that controls the size of your lungs.
- 13. .________ Priestly discovered oxygen.
Down
- 1. The bones that protect your lungs.
- 3. Another word for a windpipe
- 4. The alveoli have _____ walls.
- 5. The alveoli have a large ______ _____.
- 6. The movement of gases from a high to a low concentration.
- 9. The gas mad by photosynthesis.
- 12. The animal that was used to help discover oxygen.