Which of the following features of the alveolar sacs allows for the ease of diffusion of gasses?
A) Type II alveolar cells secrete surfactant.
B) They are made of a single layer of simple squamous epithelium.
C) They are made of a single layer of simple squamous epithelium and elastin fibers allow the alveoli to stretch thin enough for diffusion to occur.
D) Elastin fibers allow the alveoli to stretch thin enough for diffusion to occur.
B) They are made of a single layer of simple squamous epithelium.
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