The correct proximal to distal alignment of the human airway is:
A. trachea ? bronchi ? respiratory bronchioles ? nonrespiratory bronchioles ? terminal bronchioles ? alveolar ducts ? alveolar sacs
B. trachea ? bronchi ? alveolar ducts ? alveolar sacs ? bronchioles ? terminal bronchioles
C. trachea ? bronchi ? nonrespiratory bronchioles ? terminal bronchioles ? alveolar sacs ? alveolar ducts
D trachea ? bronchi ? nonrespiratory bronchioles ? respiratory bronchioles ? terminal bronchioles ? alveolar ducts ? alveolar sacs
ANS: D
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