... same. According to Tortora & Grabowski (1996) Homeostasis is a condition in which a body's internal environment remains within certain physiological limits. Homeostasis is frequently seeing as equilibrium. The internal equilibrium of the body involves the maintenance of a steady rate of concentration of substances and physical parameters such as water balance, blood concentration etc. Walter B. Cannon (1871-1945), an American physiologist, was the person that coined the term homeostasis in 1932 (Clancy, J, McVicar, A, 2002). Cannon observed that each body structure, from the very simple ones to the more complex mammals, had to contribute in some way to keep their internal balance. This internal environment is made by the following main components: tissue fluid, plasma and intracellular fluid (Hole Jr, 1993). 3. Feedback mechanisms Feedback mechanisms or loops consist of three basic components: a control centre, a receptor, and an effector (Martini, 2005). The control centre is in charge of establishing which would ...

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