approximately 8 years of age.

Function

Type I cells

Type I cells are the larger of the two cell types; they are thin, flat epithelial lining cells (membranous pneumocytes), that form the structure of the alveoli. They are squamous (giving more surface area to each cell) and have long cytoplasmic extensions that cover more than 95% of the alveolar surface. A thin lining of epithelium covers the alveoli, aiding the diffusion

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