Crossword Puzzle - Human Body System

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Across
  1. 1. tiny hair which moves in a waves
  2. 4. located at the back of the nose
  3. 7. system include heart,veins and blood
  4. 10. lines the inside of blood vessels
  5. 11. Airways lead from the trachea into the lungs
  6. 13. inhales oxygen and exhales carbon dioxide
  7. 14. breakdown of food into small molecules
  8. 17. system that includes lungs and trachea
  9. 19. substance moves from High tolow concentration
  10. 20. letting Air out of the lungs
  11. 21. fine branching blood vessels
Down
  1. 2. otherwise known as voice box
  2. 3. filter the air we inhale
  3. 5. dome shaped muscles located under the lung
  4. 6. hollow spaces in the bones
  5. 8. bone structure which protects heart,lungs
  6. 9. main organ in respiratory system
  7. 12. taking Air into the lungs
  8. 15. Enters your body
  9. 16. where two bones meet
  10. 18. tiny sacs within the lungs