From Wikipedia, https://en.wikipedia.org/wiki/Homeostasis
Homeostasis is the property of a system within an organism in which a variable, such as the concentration of a substance in solution, is actively regulated to remain very nearly constant. Examples of homeostasis include the regulation of body temperature, the pH of extracellular fluid, or the concentrations of sodium, potassium and calcium ions, as well as that of the blood sugar level, despite changes in the environment, diet, or level of activity. Each of these variables is controlled by one or more regulators or homeostatic mechanisms, which, together, maintain life.
Homeostasis is an almost exclusively biological term, concerning the constancy of the internal environment in which the cells of the body live and survive.
The metabolic processes of all organisms can only take place in very specific physical and chemical environments. The conditions vary with each organism, and with whether the chemical processes take place inside the cell or in the interstitial fluid bathing the cells. The best known homeostatic mechanisms in humans and other mammals are regulators that keep the composition of the extracellular fluid (or the “internal environment”) constant, especially with regard to the temperature, pH, osmolality, and the concentrations of sodium, potassium, glucose carbon dioxide, and oxygen. However, a great many other homeostatic mechanisms, encompassing many aspects of human physiology, control other entities in the body.
If an entity is homeostatically controlled it does not imply that its value is necessarily absolutely steady in health. Core body temperature is, for instance, regulated by a homeostatic mechanism with temperature sensors in, amongst others, the hypothalamus of the brain. The temperature regulator’s set point is reset during infections to produce a fever.
Error signals (via neurons, hormones or other) from the sensor to the effector is, of necessity, highly variable in order to convey information about the direction and magnitude of the error detected by the sensor. The effector’s response needs to be highly adjustable to reverse the error (but in the opposite direction) to the error that is threatening the internal environment. End My comment on homeopathy: Here is the key to how homeopathy works. Generally the system is failing to generate the needed error signal and the role of the homeopathic remedy is to very slightly increase the threat, to make the condition ever so slightly worse. This forces the system to recognize that it must act to employ its homeostatic mechanisms to restore balance and save itself. All true healing is self-healing. The homeopathic remedy is only a very feeble catalyst to start or push the healing process. The role of drugs, which are usually very powerful, is to take control of the system and in doing so usually crushes many other homeostatic mechanisms – that is the “side effects”. Control usually lasts only as long as the drug is given. Stop the drug, and the problem is back.
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