Structure of respiratory system

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Across
  1. 2. Switching point for air and food
  2. 3. The thinnest most delicate part of the respiratory system
  3. 4. Bone ridges that create an uneven surface in the nasal passage
  4. 6. Blood pressure is _____ in the pulmonary circuit than in the systemic circuit
  5. 7. All living things require ___ to survive
  6. 10. Produced by Type II cells
  7. 12. Another name for the windpipe
  8. 13. ______ cavity - where the lungs, heart and other organs are tightly packed
  9. 16. Organelles that produce energy
  10. 17. Tube for food which sits behind the trachea
  11. 19. Limits the distortion of the trachea
  12. 20. type of lobe found only in right lung
Down
  1. 1. Blood-gas exchange occurs through this
  2. 5. Functional classification portion that does not participate in gaseous exchange
  3. 8. One of the ways air can be taken into the respiratory tract
  4. 9. Contains vocal cords for creating sound, pitch and volume
  5. 11. Cell type which patrols the alveoli and engulfs foreign particles
  6. 14. 95% of ATP is produced by ________ metabolism
  7. 15. The smallest passageways which the main airways (bronchi) branch off into
  8. 18. Part of the throat where the mouth and nasal cavity meet