Respiratory system

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Across
  1. 2. a muscular box shaped passageway behind your nose
  2. 3. the windpipe
  3. 6. protects the lower respiratory tract from aspiring food into the trachea while breathing
  4. 8. hairy, rather than having cartilage rings like the bronchi.
Down
  1. 1. it contrast and flattens as our chest cavity enlarges upon inhalation.
  2. 4. microscopic balloon shaped air sacs that expels carbon dioxide
  3. 5. large tubes that connect to your trachea and brionchioles
  4. 7. gateway of the respiratory system