What type of alveolar cells cover over 90% of the surface area of the alveolar-capillary mem-brane?
a. Alveolar macrophages
b. Granular pneumocytes
c. Type I cells
d. Type II cells
ANS: C
The alveolar septa are covered with extremely flat squamous epithelia called type I pneumocytes (Figure 9-54). While they represent only about 8% of all the cells found in the alveolar region, the type I cells cover approximately 93% of the alveolar surface.
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