An effector is part of the negative feedback system, and is something that carries an action in response to a message from the CNS because of a change in the body. An effector is either a muscle or a gland. This article is a stub, and is very fishy. You can help GCSE Wiki by expanding it, removing the non-GCSE content or improving it. Retrieved from "https://gcse.wikia.org/wiki/Effector?oldid=4966" Categories: Biology Article stubs Add category Cancel Save Community content is available under CC-BY-SA unless otherwise noted.