length 100µm - 300µm: number of cilia 5,000 - 6,000
||Ciliate Paramecium spp.
||Martinac B, Saimi Y, Kung C. Ion channels in microbes. Physiol Rev. 2008 Oct88(4):1449-90. doi: 10.1152/physrev.00005.2008. P.1468 right column 3rd paragraphPubMed ID18923187
||P.1468 right column 3rd paragraph:"Paramecium was the first microbial cell penetrated with a microelectrode (ref 150). Being some 100–300 micrometers in length, Paramecium can easily be investigated by the classical two-microelectrode intracellular recording. Voltage-clamp experiments revealed that membrane depolarization can trigger a Ca2+-dependent action potential leading to an increase in intracilliary calcium concentration, which causes 5000–6000 cilia covering the body of a Paramecium cell to beat in a reversed direction (“avoiding reaction”) (ref 146) to propel the cell backward (refs 85, 262)." See BNID 110791