Britannica Sources used in this answer

How does negative feedback control hormone production?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

Hormone Many important physiological functions of vertebrates are controlled by steroid hormones.

Negative feedback is a fundamental regulatory mechanism that maintains hormone concentrations within a narrow, healthy range by counteracting changes in their levels. This process occurs through two primary methods:12

Direct Feedback

Some endocrine glands detect changes in blood composition directly. For example, the parathyroid glands monitor serum calcium levels. When calcium concentrations rise, receptors on the gland cells inhibit the secretion of parathormone, allowing levels to return to normal.12

The Hypothalamic-Pituitary-Target Gland Axis

More complex systems involve interconnected loops between the hypothalamus, the pituitary gland, and target glands.2
* Pituitary Loop: When a target gland releases its hormone, that hormone binds to receptors on the pituitary gland, inhibiting the secretion of the tropic hormone that originally stimulated the target gland.2
* Hypothalamic Loop: The target gland hormone also binds to nerve cells in the hypothalamus, inhibiting the release of hypothalamic-releasing hormones.2

By reducing the stimulatory signals when target hormone levels are high, the body prevents overproduction. Conversely, if hormone levels drop, the reduction in negative feedback allows for increased stimulation, restoring balance.2