Gas Exchage Puzzle

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