Cilia – SEM

Most of the epithelium (from the nose to the bronchi) is covered in pseudostratified columnar ciliated epithelial cells, commonly called respiratory epithelium. The cilia beat in one direction, moving mucus towards the throat where it is swallowed. Moving down the bronchioles, the cells get more cuboidal in shape but are still ciliated. (from wikipedia)

Cilia in the Lung Bronchiole – SEM.  by David Phillips (source image)

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