The Respiratory System

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Across
  1. 1. The elastic quality that allows the lungs to expand and contract
  2. 4. Doorway of the trachea
  3. 7. Inspiration
  4. 13. Fluid between the visceral and parietal pleurae that acts as a sort of lubricant
  5. 15. A tool for measuring the acidity or alkalinity of a substance
  6. 18. The bronchi and lungs
  7. 20. Expiration
Down
  1. 2. Separates the upper and lower airways
  2. 3. Vibrates to create sound when we talk
  3. 5. Back of the nose
  4. 6. Air-filled spaces named maxillary, front, ethmoidal, and sphenoidal
  5. 8. Microscopic-sized air sacs
  6. 9. Nostrils
  7. 10. The mouth, nose, sinuses, and pharynx
  8. 11. Divides the nasal cavity from the mouth
  9. 12. Membranes covering the lungs
  10. 14. Back of the mouth
  11. 16. Tiny hairs within the nasal cavity
  12. 17. Division of the lungs; the right has three, and the left has two
  13. 19. Divides the nasal passages into left and right sides