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Across 2. Where olfactory receptors are located 6. This lung has three lobes 10. Refers to entry of a foreign substance from the mouth or stomach 16. An abnormally low concentration of oxygen in the blood 17. Connects the naso-pharynx with the middle ear 21. Also called pleurisy and refers to inflammation of the pleura 22. Covers the opening of the trachea during swallowing so that food doesn't enter the lungs 23. When the pleural space is filled with pus. 24. The main control center for breathing 25. Globally is responsible for more deaths than any other infectious disease. Caused by an acid fast bacilli 26. The volume of air into or out of the lungs after one respiratory cycle

Down 1. Where the trachea splits into the right and left bronchi 2. For the lungs to remain expanded, the pressure in the intrapleural space must be THIS 3. These are motor nerves that supply the diaphragm and the intercostal muscles 4. An abnormally low concentration of oxygen in the tissues 5. Tears drain into here 7. A nosebleed 8. The maximum volume of air that can be exhaled following maximal inhalation 9. A function of the respiratory system 11. Rapid breathing 12. A mechanical device used to measure oxygen levels in the blood 13. Larger in men 14. The exchange of respiratory gases occurs in this way- across the alveoli and pulmonary capillaries 15. The accumulation of air in the pleural space that causes the lung to collapse 18. Characterized by destruction of alveoli, obstruction of small airways, loss of elasticity of lung tissues 19. This space is located between the visceral and parietal pleurae 20. An increase in rate and depth of respirations- Caused by metabolic acidosis 21. The major regulator of respirations