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Across 1. inherited disease affecting the lungs. 3. The two openings of the airway (the nasal cavity and the mouth) meet at the _________ 4. over 200 different viruses that cause inflammation in the upper respiratory tract. 5. bronchi is known as the ______________ 7. long-term, inflammatory lung disease that causes airways to tighten and narrow 9. Within the lungs, the bronchi branch into smaller bronchi and even smaller tubes called _____________ 10. Tiny hairs called _____ protect the nasal passageways and other parts of the respiratory tract 12. windpipe 14. small flap of tissue, covers the air-only passage when we swallow, keeping food and liquid from going into our lungs. 15. short tube contains a pair of _____________, which vibrate to make sounds. 17. Voice box 18. lungs also contain elastic tissues that allow them to inflate 19. passageway is for food, the _______________, which leads to the stomach 20. process called ____________, oxygen moves from the alveoli to the blood through the capillaries (tiny blood vessels) that line the alveolar walls.

Down 2. lung disease in which the lung is damaged, making it hard to breathe. 6. inflammation of the lungs, which usually occurs because of infection with a bacteria or virus. 7. Bronchioles, which are as thin as a strand of hair, end in tiny air sacs called _________________ 8. membranes lining the larger bronchial tubes become inflamed and an excessive amount of mucus is produced. 9. At its bottom end, the trachea divides into left and right air tubes called ___________________ 11. airtight box that houses the bronchial tree, lungs, heart, and other structures. 13. oxygen gets picked up by a molecule called ____________ 16. When we breathe out, the ______________ moves upward, forcing the chest cavity to get smaller and pushing the gases in the lungs up and out of the nose and mouth.