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Across 1. located below chest cavity ; expand and inspands chest 4. each lung is divided into these 5. air reaches and leaves lungs through this 8. flexible tissue 10. forms the outer covering of te lungs 12. another word for breahing 14. extending from the larynx to the bronchial tubes 17. the act of breathing out 19. the wasre gas 20. passage that leads from back of mouth 22. located on both sides of the chest 23. linning of the nasal cavity 24. what livving things breathe in 26. sections of the trachea ; lead to lungs 27. contains nostrils ; for breathing or smelling

Down 2. the passages formed by mouth nose lungs and throat 3. the outer covering of the lungs 6. another word for chest 7. seperates nose into passageways 9. tiny air sas 10. area between back of nose and top of trachea 11. hair-like extentions of cells 13. to breathe in 15. protects the top of trachea 16. each breathe we take moves this 18. the presence of this in the air 21. voicebox 23. slimy substance 25. lungs and heart is in the _____ or chest cavity