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Across
  1. 3. Clue: "Membrane surrounding each lung."
  2. 5. Clue: "Muscle that contracts to allow inhalation."
  3. 6. Clue: "Windpipe that connects the throat to the lungs."
  4. 9. Clue: "Tiny air sacs where gas exchange occurs."
  5. 12. Clue: "Primary entry point for air in the respiratory system."
  6. 13. Muscles Clue: "Muscles between the ribs that assist with breathing."
  7. 16. Clue: "Main organs of the respiratory system that fill with air."
  8. 17. Clue: "To breathe out."
  9. 19. Clue: "Gas essential for cellular respiration."
Down
  1. 1. Clue: "Throat passage that leads to both respiratory and digestive tracts."
  2. 2. Clue: "Relating to the lungs."
  3. 4. Clue: "Tiny hair-like structures that filter dust in the airways."
  4. 7. Clue: "Flap that prevents food from entering the windpipe."
  5. 8. Dioxide Clue: "Waste gas expelled by the respiratory system."
  6. 10. Clue: "Smaller airways that branch off from the bronchi."
  7. 11. Clue: "Sticky substance that traps particles in the respiratory system."
  8. 13. Clue: "To breathe in."
  9. 14. Clue: "Process of breathing and cellular gas exchange."
  10. 15. Clue: "Voice box located above the trachea."
  11. 18. Clue: "Two large tubes branching from the trachea into each lung."