Abstract
Paramecium is a large unicell: of the most commonly studied species, P. tetraurelia can reach 150-200 µm in length, while P. caudatum may exceed 300 µm. The cell body of both species supports 5000-6000 cilia, which are individually covered by a membrane that collectively accounts for about half of the total cell surface area. The ciliary and somatic membranes are physically contiguous, but their biochemical compositions are quite distinct. How this segregation is achieved is an interesting problem in itself (for more details, the reader is referred to chapters in this volume by Bouck et al., Williams, Chailley et al., and Kaneshiro), but it ensures a functional specialization of the two surfaces. A primary role of the ciliary membrane is in providing a barrier between the locomotory apparatus of the cilium (the axoneme) and the external environment, but it is also involved in establishing physical contact between mating-competent cells. This cell agglutination reaction is discussed in some detail by Watanabe (this volume). Also, there is evidence to suggest that cilia may be sensitive to chemicals in the environment (Preston and Usherwood, 1988). However, it is perhaps in its role as an ion-selective filter that the ciliary membrane is most important to the day-to-day survival of the unicell.
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References
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Preston, R.R., Saimi, Y. (1990). Calcium Ions and the Regulation of Motility in Paramecium . In: Bloodgood, R.A. (eds) Ciliary and Flagellar Membranes. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0515-6_7
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