Gas Exchage Puzzle

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Across
  1. 3. Hollow organ that allows you to talk and make sounds
  2. 4. Tiny sacs in lungs where oxygen and carbon dioxide exchange occurs.
  3. 7. Bones protecting the lungs and heart.
  4. 8. Air-filled spaces in the skull regulating air temperature and humidity.
  5. 11. Tube connecting mouth/nose to the windpipe.
  6. 13. Tubes branching into lungs from the trachea.
  7. 14. Tiny blood vessels facilitating gas exchange in the alveoli.
Down
  1. 1. Air passage from throat to lungs.
  2. 2. lobes Sections of the lungs.
  3. 5. Organs extracting oxygen from air and transferring it to the bloodstream.
  4. 6. Small tubes leading to the alveoli.
  5. 9. Muscle aiding in lung expansion and contraction for breathing.
  6. 10. Entry points for air into the body's respiratory system.
  7. 12. air moves in and out.