Many systems exhibit the phenomenon of homeostasis. A standard definition of homeostasis defines it as “a built-in, automated property of a system that executes and monitors events essential to the existence of the system, such as animal breathing and instinct. It is a self-regulating mechanism that allows a system to avoid paying detailed attention to its most basic functions thereby helping keep it in a steady state” (Homeostasis 1). Humans are also homeotherms. We have a dynamic constancy of internal environment. Living in an external environment over which we have little control, homeostasis basically frees us from worrying about basic body functions. As French physiologist Claude Berrard called it, a milieu exterieur and milieu interieur “an animals ability to regulate its internal environment dynamically constant permitted a life characterized by freedom and independence of changing taking place in the external environment” (Human 1).
The goal of homeostasis is to keep the internal body environment in equilibria, a process that consists of a system of inputs and outputs. Homeostasis is the maintenance of constancy despite continuously changing inputs and outputs. There are different elements in a homeostatic system which are cyclical or form a circle. This loop is known as a feed back loop which is like a climate control system, “With little change it could also be showing physiological systems for the control of body water and salt, for controlling blood pressure, or for maintaining steady levels of blood sugar” (Of Polls 6).
In healthy human beings the average body temperature ranges somewhere between 36.5 degrees Celsius and 37.5 degrees Celsius. During the late morning the temperature is slightly higher and at its lowest between 2 am and 4 am. Young people are more subject t body temperature changes than older ones. Body temperature may change for a variety o
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