Editing Flagellum (section)

====Flagella versus cilia====
[[File:Flagellum-beating.svg|thumb|350px|Beating pattern of eukaryotic "flagellum" and "cillum", a traditional distinction before the structures of the two are known.]]

The regular beat patterns of eukaryotic [[cilia]] and flagella generate motion on a cellular level. Examples range from the propulsion of single cells such as the swimming of [[spermatozoa]] to the transport of fluid along a stationary layer of cells such as in the [[respiratory epithelium#Mucociliary Escalator|respiratory tract]].<ref name=Lodish00/>

Although eukaryotic [[cilia]] and flagella are ultimately the same, they are sometimes classed by their pattern of movement, a tradition from before their structures have been known. In the case of flagella, the motion is often planar and wave-like, whereas the motile cilia often perform a more complicated three-dimensional motion with a power and recovery stroke.<ref name=Lodish00>{{cite book |last1=Lodish |first1=Harvey |last2=Berk |first2=Arnold |last3=Zipursky |first3=S. Lawrence |last4=Matsudaira |first4=Paul |last5=Baltimore |first5=David |last6=Darnell |first6=James |title=Cilia and Flagella: Structure and Movement |date=2000 |isbn=0-7167-3136-3 |url=https://www.ncbi.nlm.nih.gov/books/NBK21698/ |chapter=Section 19.4Cilia and Flagella: Structure and Movement}}</ref> Yet another traditional form of distinction is by the number of 9+2 organelles on the cell.<ref name=pmid20145000>{{cite journal |last1=Lindemann |first1=CB |last2=Lesich |first2=KA |title=Flagellar and ciliary beating: the proven and the possible. |journal=Journal of Cell Science |date=15 February 2010 |volume=123 |issue=Pt 4 |pages=519–28 |doi=10.1242/jcs.051326 |pmid=20145000 |s2cid=18673550 |doi-access=}}</ref>