Breath of fresh air

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Across
  1. 4. maintain this value between 7.35-7.45
  2. 5. section of lung
  3. 6. used to assess respiratory function
  4. 8. breathing out
  5. 9. where gas exchange occurs in the lung
  6. 10. chronic bronchitis
  7. 13. breathing in
  8. 15. related to respiratory system
  9. 17. blood supply to the alveo-capillary network
  10. 18. large conducting airway
  11. 19. reversible respiratory disease
  12. 20. produced in chronic bronchitis
Down
  1. 1. element necessary for life
  2. 2. one test of respiratory function
  3. 3. technical term for breathing
  4. 7. upper respiratory tract infection
  5. 11. emphysema
  6. 12. location of respiratory centre
  7. 14. amount of air inspired expired in one breath
  8. 16. major inspiratory muscle
  9. 21. chronic obstructive airway disease