![]() Its major activities or functions are responding to changes in the body's environment, exchanging materials between the environment and cells, metabolizing foods, and integrating all of the body's diverse activities. Homeostasis depends on the body's ceaselessly carrying on many activities. In his words, homeostasis "means a condition that may vary, but which is relatively constant." However, as Cannon emphasized, homeostasis does not mean something set and immobile that stays exactly the same all the time. "Standing or staying the same" then is the literal meaning of homeostasis. It comes from two Greek words - "homeo," meaning the same, and "stasis," meaning standing. Homeostasis is a key word in modern physiology. Cannon (1871-1945), suggested the name homeostasis for the relatively constant states maintained by the body. Later, an American physiologist, Walter B. He noted that body cells survived in a healthy condition only when the temperature, pressure, and chemical composition of their environment remained relatively constant. More than a century ago, French physiologist, Claude Bernard (1813-1878), made a remarkable observation. Survival depends on the body's maintaining or restoring homeostasis, a state of relative constancy, of its internal environment. Survival is the body's most important business. The body's functions are ultimately its cells' functions. Acknowledgements Body Functions & Life Process Body Functionsīody functions are the physiological or psychological functions of body systems.
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