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There are three major alveolar cell types in the alveolar wall (pneumocytes):

* Type I cells that form the structure of an alveolar wall
* Type II cells that secrete surfactant to lower the surface tension of water and allows the membrane to separate thereby increasing the capability to exchange gases.
* Type III cells that destroy foreign material, such as bacteria.

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Q: What are the three types of alveolar cells?
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