Cilia up close
Cilia are a type of organelle found in eukaryotic cells. In the innate immune system, they serve to move pathogens out of the respiratory system via a concerted sweeping motion.
Source
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"Bronchiolar epithelium 3 - SEM."
http://en.wikipedia.org/wiki/File:Bronchiolar_epithelium_3_-_SEM.jpg
Wikipedia
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