English

Noun

ion channel ‎(plural ion channels)

1. (biochemistry) a protein complex or single protein which penetrates a cell membrane and catalyzes the passage of specific ions through that membrane.
   • 2008 Daniels, David. "Ion Channels Play Key Role in R&D". 1 June 2008. Genetic Engineering & Biotechnology News, 28 (11), pg 24. Archived version of cited article; archived 2 January 2010. ISSN 1935-472X. OCLC 77706455.

     Ion channels, which facilitate this movement, are protein assemblies that penetrate the membrane and catalyze passage of specific ions such as sodium (Na+), potassium (K+), or calcium (Ca2+) into or out of the cell down the electrochemical gradient.