Respiratory tract

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Across
  1. 3. The trachea splits into 2 primary ______
  2. 4. Walls of the alveoli consists of a _______ layer of cells
  3. 5. Acts as a switch between larynx and esophagus
  4. 8. The epithelium contains ____ cells that secrete mucus
  5. 13. Aveoli provides _____ exchange
  6. 15. At rest air flows in through the
  7. 17. Curved shelves of bone that are inside the nasal cavity
  8. 18. Bronchioles have a diameter of _______mm or less
  9. 19. Short tube that has lot of cartilages connected by ligaments
Down
  1. 1. These are the smallest airways of respiratory tract
  2. 2. The trachea has _______ rings of cartilage connected by smooth muscle.
  3. 6. The number of divisions within the respiratory system
  4. 7. There are approximately ________ alveoli
  5. 9. Another word for windpipe
  6. 10. The alveolar ducts are _____ that connect the respiratory bronchioles to alveoli
  7. 11. Common pathway for respiratory and digestive tracts
  8. 12. The direction that cilia beats to push mucus
  9. 14. Cilia is surrounded by this fluid film
  10. 16. The hair shaped structure located on surface pf epithelium