Britannica
Sources used in this answer
- human endocrine system - Feedback regulation mechanisms of endocrine signaling
- pituitary gland - Regulation of anterior pituitary hormones
- human endocrine system - Maintenance of homeostasis
- human endocrine system - The nature of endocrine regulation
- Physiology - Regulation
- human endocrine system - Acquired and congenital endocrine hypofunction
- human endocrine system - Other causes of endocrine hypofunction
How does negative feedback keep hormone levels within a normal range?
Created from Britannica articles
using AI.
AI can make mistakes, so verify using Britannica articles.
human endocrine system
The principal glands of the female and male human endocrine systems.
Negative feedback is a fundamental regulatory mechanism in the human endocrine system that maintains hormone concentrations within a narrow, healthy range. It functions by using the hormone's own presence or its physiological effects to inhibit further production, thereby preventing excessive levels.123
This regulation occurs through two primary patterns:
- Direct Feedback: Some glands detect changes in blood chemistry directly. For example, the parathyroid glands monitor serum calcium levels. When calcium is high, receptors inhibit the secretion of parathormone; when levels drop, the inhibition is lifted, stimulating hormone release to restore balance.12
- Hypothalamic-Pituitary-Target Gland Axis: This complex system involves multiple feedback loops. The hypothalamus and pituitary gland stimulate a target gland to release its hormone. As the target gland's hormone levels rise in the blood, it acts on the pituitary and hypothalamus to suppress the release of stimulating hormones. This effectively "turns off" the signal for more production once sufficient levels are reached.42
These loops ensure homeostasis, though they can be overridden by external factors like severe stress or environmental changes.423