In the body of an animal conditions such as water concentration, temperature, and glucose concentration must be kept as constant as possible. A negative feedback control system responds when conditions change from the ideal or set point and returns conditions to this set point.
An example of negative feedback can be seen in osmoregulation; the control of water concentration in blood and body fluids. ADH increases the permeability of the kidney [kidney: one of two organs in humans which extract impurities from the blood]  tubules allowing water to be reabsorbed from the tubules into the blood.
If blood water concentration falls, more water reabsorption is needed so that less water is lost as urine.
If blood water concentration rises, less water reabsorption is needed so that more water is lost as urine.
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Control systems that keep such conditions constant are examples of homeostasis; this is the maintenance of constant internal conditions in an organism. You can tuck into a good biology book, and try some kitchen science, or even join the biology forum! While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.

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  1. 23.03.2016 at 12:56:53

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    Author: Yeraz
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    Blurring of the vision, or it can particular diseases, especially if you have less fluctuation.

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