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rheostat noun [C]. âº a âdevice used to âcontrol and âchange the âflow of âelectric âcurrent through a âmachine such as an âelectric âlight. (Definition of rheostat from the Cambridge Advanced Learnerâs Dictionary & Thesaurus Â© Cambridge University Press).
Homeostasis is the process by which a nearly stable internal environment is maintained in the body so that cellular metabolic functions can proceed at maximum efficiency. Homeostasis is maintained by muscles or glands that are regulated by sensory information from the internal environment.