The complex, self-regulating control system within the endocrine network, primarily involving the hypothalamic-pituitary-target gland axes, that maintains hormone concentrations within narrow physiological ranges. This governance relies on negative and positive feedback loops where the output of a target gland, such as cortisol from the adrenal cortex, signals back to the hypothalamus and pituitary to modulate the release of upstream stimulating hormones. Effective governance is synonymous with endocrine stability and health.
Origin
This fundamental concept is central to classical endocrinology, originating from early physiological studies demonstrating the homeostatic regulation of hormone secretion. ‘Feedback’ describes the circular nature of the control system, and ‘Governance’ is used here to emphasize the systemic authority and precision of this regulatory mechanism. The Hypothalamic-Pituitary-Adrenal (HPA) and Hypothalamic-Pituitary-Gonadal (HPG) axes are primary examples.
Mechanism
The mechanism is initiated when circulating hormone levels are sensed by specialized receptors in the hypothalamus and pituitary gland. For instance, high levels of a peripheral hormone trigger a negative signal that reduces the release of the corresponding releasing or stimulating hormone, thereby dampening the target gland’s output. This constant, dynamic adjustment ensures that hormonal signals remain appropriate for the body’s physiological needs and prevents over- or under-secretion.
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