Across
- 3. Element we need to live
- 5. also known as the windpipe
- 6. Strong breathing muscle
- 7. Bone like substance
- 9. Lung with two lobes
- 10. Carries oxygen
- 12. Vessels to the heart
- 13. Membranes
- 14. Common name for alveoli
- 18. Oral opening for air
- 20. Describes breathing
- 21. What we breathe
- 22. Bronchial __________
- 24. Protects the lungs and heart
Down
- 1. Section of the lung
- 2. Vessels to the body
- 4. To let out air
- 7. Sinus ______
- 8. Air sacs
- 11. Organs for breathing
- 15. Lung with three lobes
- 16. tiny hair like structure
- 17. Four chambered organ
- 18. Thick fluid in the sinuses
- 19. Element of living things, _______ dioxide
- 23. Using air