TERMINAL DIVISIONS OF BRONCHI AND ULTIMATE AIR-SPACES. 3 I 3 



D. TERMINAL DIVISIONS OF BRONCHI AND ULTIMATE 



AIR-SPACES, 



The bronchioles are continued as the respiratory bronchioles. 



- - Artery. 



Lung tissue. 



... Bronchiole. 



Fig. 248. 



Respiratory 

 bronchiole. 



Alveolar duct. 



: Lung tissue. 



Fig. 249. 

 Figs. 248 and 249. Two sections of cat's lung : Fig. 248, X 5 2 '> Fig. 249, X 35- 



The epithelium of the latter is ciliated in patches, but soon becomes 

 nonciliated and assumes the character of respiratory epithelium. 



