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Across 1. Narrow opening through which inhaled air leaves the pharynx and enters the larynx 5. Branches of bronchial tree between the trachea and bronchioles 6. A chronic, progressive condition of shortness of breath and inability to tolerate physical exertion 7. A localized region or groove that allows passage of the primary bronchi, pulmonary vessels, nerves, and lymphatics 8. Respiratory muscle that helps produce sounds in speaking and singing 11. General term for three progressive disorders of the airways that restrict airflow and ventilation 12. The throat; a muscular passageway shared by the digestive and respiratory tracts 13. A chamber or hollow in a tissue 15. Condition characterized by respiratory passageways that are extremely sensitive to irritation

Down 2. Lipid secretion that coats the alveolar surfaces of the lungs and prevents their collapse 3. About 150 million tiny, blind pocket sacs at the end of the respiratory tree in the lung 4. The oblique ________ divides the left lung into 2 lobes: superior and inferior 9. Low tissue oxygen levels 10. Thick and sticky fluid that can accumulate and restrict airflow and lead to cystic fibrosis (CF) 14. Filters incoming air