Across
- 2. opening for air
- 4. what we breathe
- 5. 4-chambered organ
- 8. lung with two lobes
- 9. bone like substance
- 11. strong breathing muscle
- 13. vessels to body
- 16. describes sinuses
- 19. lung with three lobes
- 20. element of living things _____ dioxide
- 22. organs for breathing
- 23. element we need to live
Down
- 1. membranes
- 3. windpipe
- 4. air sacs
- 6. describes breathing
- 7. vessels to heart
- 10. let out air
- 12. using air
- 14. protects lungs and heart
- 15. tiny hairs
- 17. thick fluid in the sinuses
- 18. bronchial ________
- 21. carries oxygen
- 22. part of lung