respiratory system

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Across
  1. 3. inhale exhale
  2. 6. tiny hairs
  3. 11. throat area
  4. 12. breathing organs
  5. 13. Breathe out
  6. 15. adding oxygen
  7. 17. chest lining
  8. 18. Air pockets
Down
  1. 1. the windpipe
  2. 2. air exchange or air circulation
  3. 4. breathing muscle
  4. 5. air tubes
  5. 7. the olfactory organ for smelling
  6. 8. air sacs
  7. 9. voice box
  8. 10. breathe in
  9. 14. thoracic cage
  10. 16. Viscous fluid