Chapter 11

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Across
  1. 2. a flap of tissue that closes automatically over your trachea
  2. 7. when you breathe in
  3. 8. tiny air sacs the bronchioles end
  4. 10. the two tubes that the trachea branches off into
  5. 12. a type of breathing that takes place when you thing about and control it
  6. 13. known as your voice box located at the top of your trachea
  7. 14. the human breathing system
Down
  1. 1. tiny hair-like structures that line your nasal passage as well as most of the respiratory system
  2. 3. also known as the "windpipe"
  3. 4. when you breathe out
  4. 5. a strong, curved muscle attached below the lungs to the lower ribs and backbone
  5. 6. a type of breathing that your brain does automatically
  6. 9. the chords that stretch across the inside of your larynx
  7. 11. two saclike organs that replace the carbon dioxide in your blood with oxygen
  8. 15. the air that moves from your nose or mouth into your throat