Respiratory

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Across
  1. 4. towards the head
  2. 6. towards the tail
  3. 9. slow breathing
  4. 10. prefix for 1 billionth
  5. 13. middle section of thoracic cavity
  6. 16. how many pairs of floating ribs are there?
  7. 17. head lower than body (position)
Down
  1. 1. “throat”
  2. 2. how many pairs of true ribs are there?
  3. 3. hypoxia that occurs from cyanide
  4. 5. only complete cartilage ring in larynx
  5. 7. microbes that grow without O2
  6. 8. normal breathing
  7. 9. (law) pressure and volume are inversely related
  8. 11. disease transmitting organism
  9. 12. frontal plane (anatomy)
  10. 14. perfusion without ventilation
  11. 15. “root” of the lung