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Feedback mechanism



(1) A loop system in which the system responds to perturbation either in the same direction (positive feedback) or in the opposite direction (negative feedback).

(2) A process in which the level of one substance influences the level of another substance.

(3) A mechanism or a signal that tends to initiate (or accelerate) or to inhibit (or slow down) a process.


An example of positive feedback loop is the onset of contractions in childbirth. When contraction begins, the hormone oxytocin is released into the body to stimulate further contractions. As for the negative feedback loop, an example is the regulation of blood glucose levels. If blood glucose levels continue to rise it may result in diabetes. In fact, there are many biologic processes that use negative feedback to maintain homeostasis or dynamic equilibrium.

See also: negative feedback, positive feedback.

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minimal biological function

... is not simply a reversible variation (adaptable feature) d) a concrete mechanism at the molecular level e) when I mean "interdependent", ... as I am not a biologist of any type. I would really appreciate the feedback and links and references to papers if possible. Thank you.

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by tenician
Sun May 05, 2013 6:08 pm
Forum: Evolution
Topic: minimal biological function
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Positive feedback -- NOT homeostasis?

... lecture, the professor asked us, "Who agrees that positive feedback is not a homeostatic mechanism?" He then asked the ones who did raise their hands to stand up. He applauded ...

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by Triangular
Sun Oct 07, 2012 12:55 pm
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by Forests
Thu Jul 05, 2012 2:07 pm
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Re: Theories - Origin of Life

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by scottie
Tue Jan 17, 2012 11:04 pm
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by JackBean
Fri Sep 30, 2011 1:35 pm
Forum: Molecular Biology
Topic: Energy, enzymes & metabolism Questions.
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