This concept describes the active, homeostatic regulation of the internal milieu—the fluid composition, pH, nutrient concentrations, and endocrine signaling milieu surrounding the cells. Effective control ensures optimal conditions for enzymatic activity and receptor binding throughout the organism. It is the maintenance of systemic physiological stability.
Origin
Rooted in Claude Bernard’s concept of the internal environment (milieu intérieur), this term is updated to reflect modern understanding of dynamic biochemical regulation. Control implies an active, often neuroendocrinologically mediated, feedback system maintaining set-points against external perturbations. This regulatory effort underpins overall vitality.
Mechanism
Control is executed via integrated feedback loops involving the hypothalamus, pituitary, and peripheral endocrine glands, alongside renal and hepatic clearance mechanisms. For example, tight glucose homeostasis relies on insulin and glucagon interplay to maintain the required extracellular chemical balance. This continuous adjustment prevents cellular stress and maintains receptor functionality.
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