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