Respiratory system

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Across
  1. 2. an addictive component of tobacco smoke
  2. 5. cell, cell in the lining to sweep mucus
  3. 6. alveoli collapsed due to lack of elastic fiber
  4. 8. parallel with the trachea
  5. 11. sharp and loud expel air from lungs
  6. 13. 2 airways to the lungs
  7. 15. biggest organ in the respiratory system
  8. 16. windpipe after the pharynx
  9. 17. the circulation of gas in lungs
  10. 18. a slimy thing that trap dust and germs
Down
  1. 1. a component of tobacco smoke that can cause cancer
  2. 3. stiff and keep the respiratory tract open
  3. 4. cell that fight against infection
  4. 7. bronchial allergy to the allergen
  5. 9. epithelium, provides a short distance for gas exchange
  6. 10. monoxide, toxic odorless gas
  7. 12. cell, cell that produce mucus
  8. 14. air sacs for gas exchange