What is the Origin of Positive Feedback Mechanisms?

The concept is derived from control theory and systems biology, applied to the endocrine system to explain processes that deviate from the typical homeostatic balance. The term is descriptive, indicating a regulatory signal that reinforces the initial stimulus.

What is the Mechanism of Positive Feedback Mechanisms?

A classic example is the hormonal cascade leading to ovulation, where rising estrogen levels from the developing ovarian follicle act on the hypothalamus and pituitary to dramatically increase the secretion of Luteinizing Hormone (LH). This LH surge then triggers the final steps of follicular rupture and ovum release. This temporary amplification loop ensures the timely and sufficient release of a hormone to complete a critical biological event.

Positive Feedback Mechanisms ∞ Area

Positive Feedback Mechanisms

Meaning

A type of regulatory control loop within the endocrine system where the output of a system acts to further increase the input, thereby driving the system rapidly toward a definitive end-point or amplifying a physiological response. Unlike the more common negative feedback, which maintains homeostasis, positive feedback is designed to create a rapid, non-equilibrium change. This mechanism is crucial for processes requiring a swift, large-scale hormonal surge.