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Across 4. Inflammation or infection of one or both of the lungs caused by bacteria, viruses, or fungi 9. Tiny air sacs within the lungs where oxygen and carbon dioxide exchange 10. Inflammation of the nasal mucous membrane, resulting in a runny nose, soreness, and congestion 15. The act of inhaling air in order to exchange oxygen for carbon dioxide 18. Nosebleed 19. This is the leading cause of cancer death in both men and women 21. The flap that covers the trachea during swallowing so that food does not enter the lungs. 22. When air is forced out of the lungs; exhalation 24. The process of breathing 26. Inflammation of the mucous membrane lining the sinuses 27. Highly contagious infection caused by bacteria; symptoms are night sweats, coughing up blood tinged sputum, feve, and weight loss 28. Pair of breathing organs located within the chest which remove carbon dioxide from the blood and bring oxygen into the blood 29. A gas that is required by all body cells 30. Thin covering that protects and cushions the lungs 31. Tiny tube within the respiratory system that is a continuation of the bronchi and connects with the alveoli

Down 1. Inflammation fo the larynx and vocal cords 2. Chronic lung disease that results in obstruction of the airways 3. Respiratory disorder usually caused by a sensitivity to an allergen 5. Chronic respiratory condition that occurs when the walls of the alveoli deteriorate and lose their elasticity 6. Large air tubes leading from the trachea to the lungs and convey air to and from the lungs 7. The opening between the vocal cords 8. Throat; lies directly behind the nasal cavities 11. Highly contagious viral infection of the upper respiratory system 12. Tube-like portion of the respiratory tract that connects the larynx with the bronchial parts of the lungs 13. Inflammation of the bronchi and bronchial tubes, usually caused by infection 14. The process of breathing in air; inhalation 16. Inflammation of the pleura or membranes of the lungs 17. Coughing up blood-tinged sputum 20. A gas that is a metabolic waste product produced by the cells 23. Fine hairlike projections within the respiratory tract that help to sweep away fluids and particles 25. Voice box 26. Air filled cavity in a dense portion of the skull