feedback mechanism


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feed·back in·hi·bi·tion

(fēd'bak in'hi-bish'ŭn)
Inhibition of activity by an end product of the pathway of which that activity is a part.
Synonym(s): feedback mechanism.
Feedback mechanismclick for a larger image
Fig. 159 Feedback mechanism . Excess production of X causes a shutdown of the process by inhibition of the first step from A to B.

feedback mechanism

a mechanism by which the products of a process can act as regulators of that process. Many biochemical processes are controlled by negative feedback mechanisms. See Fig. 159 . Mammals utilize negative feedback mechanisms to maintain HOMEOSTASIS in several systems, for example blood thyroxine levels, body temperature, blood osmotic pressure. Occasionally positive feedback occurs, which is a disruptive process where products of a process cause further ACTIVATION; for example, excess core heat in mammals will in turn encourage a higher metabolic rate which produces yet more heat and eventually death.
References in periodicals archive ?
When there is not enough natural cortisol produced in any form in order to fund this negative feedback mechanism to the hypothalamic pituitary axis, the pituitary will continue producing its ACTH.
Then, a fuzzy feedback mechanism is designed to perform an adaptive modification of neural network connection weights.
Once the feedback mechanism engages, the eye will elongate to eliminate the blurring-becoming myopic in the process.
In addition to the new feedback mechanism, users are now able to send copies of WhosRegistered.
Propose a feedback mechanism ensuring that the results of the re-analysis process get appropriately reflected into updates of the CDR.
The interactive feedback mechanism generated through OpinionWare's Web infrastructure solution gives RealHome.
to serve as a focused feedback mechanism for Microsoft Windows Mobile platform development, and to provide leading companies with the tools and resources they need to bring the most innovative and successful mobility solutions to market.
creation of a feedback mechanism through institutional strengthening of the information collection and analysis system; 5.
The ISO process insures that Ampro has a feedback mechanism that includes customers and the total company, giving customers greater visibility.
This feedback mechanism ensures that so-called stem cells in a developing roundworm die when they are no longer needed, says Hengartner.
Concern also served as a valuable feedback mechanism for communicating employees' needs and concerns to management.
The results indicate that a positive feedback mechanism regulates brain aromatase and imply that the sexual dimorphic distribution of aromatase may be highly sensitive to physiologic cues and environmental perturbations in fish.