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Explain how the ciliated epithelial cells lining the trachea are columnar in their appearance.

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As the name implies, the columnar cells of the epithelium in the trachea have a regular, column-like appearance. This distinguishes them from other epithelial types, such as simple squamous and simple cuboidal epithelia, which are respectively flat and circular and low and square-like. Important to this question, however, is how a columnar morphology facilitates the function of tracheal epithelial cells.

Near the surface of the tracheal mucosa there are...

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