Which feature of the alveoli allows for the ease of diffusion of gases?
◦ Type II alveolar cells secrete surfactant.
◦ 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.
◦ Elastin fibers allow the alveoli to stretch thin enough for diffusion to occur.
◦ They are made of a single layer of epithelium.