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Homeostasis or homoeostasis is the property of a system in which a variable is actively regulated to remain very nearly constant. This regulation occurs inside a defined environment . Examples of homeostasis include the regulation of the body temperature of an animal, the pH of its extracellular fluids, or the concentrations of sodium and calcium ions or of glucose in the blood plasma, despite changes in the animal?s environment, or what it has eaten, or what it is doing . Each of these variables is controlled by a separate ?homeostat? , which, together, maintain life. Homeostats are energy-consuming physiological mechanisms.