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Any of various molecules, such as cytochromes and quinonoid compounds, that accept one or two electrons from one molecule and donate them to another in the process of electron transport, resulting in the release of energy that is used to produce ATP.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
electron carrierA compound, such as a coenzyme, capable of taking up electrons from a molecule and transferring them to another, thereby undergoing reversible reduction and oxidation.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005