Across
- 1. change from gas to liquid
- 3. the main airway o the lungs
- 6. breathing out, to remove carbon dioxide
- 7. breathing in, to take in oxygen
- 9. a pair f breathing organs
- 10. exchange the transfer of gas between an organism and its environment
- 11. the action of breathing
Down
- 2. the muscle that separates the chest cavity from the abdomen
- 4. the bones that protect the lungs
- 5. a structure inside the lungs
- 8. system the organs allows you to breath