Across
- 1. carries air from lungs
- 3. are the only organs that can float on water
- 4. carries air, food and fluid down from the nose and mouth
- 8. doesnt have blood vessels or nerves
- 10. breathing in air
- 11. 300 - 500 million of them in adult lungs
- 12. humans have 2 of them
- 14. help move chest walls
- 15. connects the throat to the windpipe
- 16. cell that carries oxygen
Down
- 2. break down glucose to produce ATP
- 5. stiff flexible tissue at the back of tongue
- 6. carry air to lungs
- 7. aids in coughing
- 9. breathing out air
- 13. delivers oxygen and removes carbon dioxide