Respiratory system

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Across
  1. 2. pleura outer layer of the pleura
  2. 4. the movement of molecules from an area of high concentration to low concentration
  3. 7. where digestive and respiratory tracts meet
  4. 8. "Adams apple"
  5. 11. windpipe
  6. 16. pleura inner layer of the pleura
  7. 17. the voice box
  8. 18. two layered membrane that surrounds the lungs
  9. 19. openings from the nasal cavity that extend into the bone of the skull
  10. 20. the exchange of oxygen and carbon dioxide in the body’s cells
  11. 21. branch off from the windpipe
Down
  1. 1. formed by nasal mucosa at the top of the mouth
  2. 3. contracts and moves downward during inspiration
  3. 5. behind the nasal cavities and above the soft palate
  4. 6. internal portion of the nose that is lined with mucous
  5. 9. the respiratory muscles relaxing to exhale
  6. 10. the respiratory muscles contracting to inhale
  7. 12. muscles generates pressure changes in the lungs
  8. 13. millions of small sacs where diffusion for gas exchange occurs
  9. 14. throat
  10. 15. divisions of the lungs that are serviced by the bronchiole