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A cilium (plural cilia) is an organelle found in eukaryotic cells. Cilia are slender protuberances that project from the much larger cell body.[1]
There are two types of cilia:
- motile cilia, which beat against fluid outside the cell.
- non-motile, or primary cilia, which typically serve as sensory organelles.
In eukaryotes, cilia and flagella together make up a group of organelles known as undulipodia.[2] Eukaryotic cilia are structurally identical to eukaryotic flagella, although distinctions are sometimes made according to function and/or length.[3]
Motile cilia are found on protist ciliates like Paramecium. They are how Paramecium moves around. They are also found on the epithelial cells of many internal organs of metazoans, such as the digestive system and the trachea of the lungs.
- ↑ Gardiner, Mary Beth (September 2005). "The importance of being cilia". HHMI Bulletin. 18 (2). Howard Hughes Medical Institute. Archived from the original (PDF) on 2010-03-11. Retrieved 2008-07-26.
- ↑ A Dictionary of Biology , 2004, accessed 2010-04-06.
- ↑ Haimo LT, Rosenbaum JL (December 1981). "Cilia, flagella, and microtubules". J. Cell Biol. 91 (3 Pt 2): 125s–130s. doi:10.1083/jcb.91.3.125s. PMC 2112827. PMID 6459327.