What is Signal (biology)?
A '''signal''' in [[biology]] is any kind of [[code]]d [[wikt:message|message]] sent from one [[organism]] to another, or from one place in an organism to another place. *Vocal calls *Some social [[behaviour]]s *Chemical signals **inside organisms ***nerve transmission ***hormones **inside cells **between organisms In [[biology]], especially in [[electrophysiology]], a '''signal''' or '''biopotential''' is an [[electric]] quantity ([[voltage]] or [[Electric current|current]] or [[field strength]]), that is caused by [[chemical reaction]]s of [[Electric charge|charged]] [[ions]]. Biological signals can also be seen as an example of [[signal (electrical engineering)]]. Another use of the term lies in the transfer of information between and within cells, as in [[signal transduction]]. ==Related pages== * [[Signal transduction]] {{biology-stub}} [[Category:Physiology]] [[Category:Ethology]]