Respiratory System Crossword

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Across
  1. 6. Tiny hair-like structures that line the walls of your respiratory system.
  2. 8. Molecule that leaves the blood and is breathed out (2 words).
  3. 10. Keep track of the levels of oxygen and carbon dioxide levels (2 words).
  4. 14. When the trachea is blocked and air can’t get through
  5. 16. Tiny air sacs where oxygen enters the blood.
  6. 17. Molecule that the respiratory system brings into your body.
  7. 18. System this article is about!
  8. 19. Where the air goes after the trachea.
Down
  1. 1. Tiny blood tubes surrounding the alveoli.
  2. 2. "Windpipe"
  3. 3. Organ that receives signals to breathe faster.
  4. 4. Sticky substance that traps dust and particles.
  5. 5. Brings oxygen in and moves carbon dioxide out.
  6. 7. What nose hairs and mucus do to large particles to keep them out of the lungs
  7. 9. First place air enters (besides the mouth!)
  8. 11. Flap that helps us keep food out of the respiratory system.
  9. 12. What's bigger - a cell or a molecule?
  10. 13. When you are exercising, your cells need ______ oxygen and carbon dioxide.
  11. 15. How Miss Riley will feel when she sees you all tomorrow!!