34 



RESPIRATION 



diagrammatically this arrangement. The finest ordinary bronchi- 

 oles divide up to form "respiratory bronchioles" with alveoli in 



Figure 8. 



Diagram showing arrangement of three lung lobules, with their 

 bronchiole, respiratory bronchioles, alveolar ducts, atria, and air- 

 sacs. (After colored plate by Miller, Journ. of Morphol. 24, p. 459, 

 1913.) 



their walls, and the respiratory bronchioles branch into "alveolar 

 ducts" lined with ordinary alveoli, and each opening into from 



