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Across 4. Spaces containing air which serve as resonating areas for speech 5. Law which states the pressure of a gas in a closed container is negatively related to the containers volume 6. Area of the brain which prevents the lungs from becoming to full by limiting inspiration 9. Gas exchange between the lungs and the blood 10. Law which states each gas in a mixture has its own partial pressure independent of other gases 13. Area of the brain which controls size of an exhale during labored breathing 15. Flap which prevents food from entering the trachea when swallowing 16. A decrease in the partial pressure of CO2 20. CO2 in the blood combines with H2O to form this chemical 21. Portion of the pharynx directly behind the oral cavity 22. Uppermost portion of the pharynx connected to the internal nares 23. Area of the brain which stimulates muscles controlling inhalation to contract 24. Voicebox

Down 1. Gas exchange between the blood and cells 2. Gas exchange between the atmosphere and the lungs 3. Muscle located at the base of the lungs 7. The form which oxygen is carried as in the blood 8. Portion of the pharynx where the digestive and respiratory structures diverge 11. Area of the brain which stimulates a prolonged inspiration 12. Tubes which connect the trachea and alveoli 14. An increase in the partial pressure of CO2, stimulates chemoreceptors 17. Law which states quantity of a gas that will dissolve in a liquid is proportional to the partial pressure and solubility of the gas at a constant temperature 18. Common passageway for food and air 19. Tube which splits into the bronchi in the lungs