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Feedback Loops

Feedback Loops

In most cases, excessive hormone production is prevented by negative feedback—a loop that starts with a stimulus inducing the release of a particular substance, like a hormone, to maintain a certain level before triggering a signal that results in a decrease in further release of the hormone.

Regulation of Hormone Secretion

Regulation of Hormone Secretion

Regulation of hormone secretion is a finely tuned orchestration driven by various types of stimuli, encompassing neural, humoral, and hormonal signals. Environmental cues instigate neural stimuli, where action potentials traverse nerve fibers to reach their designated targets. An illustrative scenario is the body's response to stress, wherein the sympathetic nervous system releases epinephrine from the adrenal glands, inducing the well-known 'fight or flight' reaction.
Humoral stimuli,...

Positive and Negative Feedback Loops

Positive and Negative Feedback Loops

Animal organs and organ systems constantly adjust to internal and external changes through a process called homeostasis ("steady state"). Examples of these changes include regulation of the level of glucose or calcium in the blood or internal responses to external temperatures. Homeostasis requires maintaining an internal dynamic equilibrium:

An Overview of the Endocrine System

An Overview of the Endocrine System

The endocrine system, a complex network of glands, orchestrates physiological balance within the body through the production and secretion of hormones. These hormones are chemical messengers in intercellular communication, acting as conduits between the secretory cells and distant target sites. They traverse the circulatory system by being released into the extracellular fluid, and their impact is specific to cells possessing receptors for a particular hormone.
The endocrine system collaborates...

Cell Signaling Feedback Loops

Cell Signaling Feedback Loops

Positive and negative feedback loops are crucial for regulating biological signaling systems. These feedback loops are processes that connect output signals to their inputs.
Negative feedback loops
Most signaling systems have negative feedback loops that can perform different functions such as output limiter, and adaptation.
Output limiter
Upon receiving an input signal, the cellular response rapidly increases until a threshold is reached. Beyond this threshold, a negative feedback loop...

What is Homeostasis?

What is Homeostasis?

Maintaining homeostasis requires that the body continuously maintain its internal conditions. Each physiological condition has a particular set point, from body temperature to blood pressure to levels of certain nutrients. A set point is the physiological value around which the normal range fluctuates. A normal range is a restricted set of values that is optimally healthful and stable. For example, the set point for normal human body temperature is approximately 37°C (98.6°F). Physiological...

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Related Experiment Video

Updated: Jul 19, 2026

Parallel Measurement of Circadian Clock Gene Expression and Hormone Secretion in Human Primary Cell Cultures

Parallel Measurement of Circadian Clock Gene Expression and Hormone Secretion in Human Primary Cell Cultures

Published on: November 11, 2016

Dynamic model of hormonal systems coupled by negative feedback.

C H Londergan¹, E Peacock-López

¹Department of Chemistry, Williams College, Williamstown, MA 01267, USA.

Biophysical Chemistry

|October 13, 2006

Summary

Complex hormone release patterns, like pulsatile release, may stem from simple negative feedback loops. Our model shows how cell coupling can generate diverse, dynamic hormonal oscillations.

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Last Updated: Jul 19, 2026

Parallel Measurement of Circadian Clock Gene Expression and Hormone Secretion in Human Primary Cell Cultures

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Area of Science:

Physiology
Biophysics
Systems Biology

Background:

Hormone concentrations are typically regulated by negative feedback mechanisms.
Many hormones exhibit complex, pulsatile release patterns.
The underlying mechanisms for these complex patterns are often poorly understood.

Purpose of the Study:

To investigate the potential of simple feedback systems to generate complex hormone release dynamics.
To model the interaction of two cells coupled via negative feedback to external products.

Main Methods:

Developed a computational model of two coupled cells.
Simulated negative feedback loops between cells and their external products.
Analyzed the dynamic behaviors, including oscillations, emerging from the model.

Main Results:

The model demonstrated periodic, aperiodic, and chaotic oscillations.
Cellular coupling was identified as a key factor driving these dynamic behaviors.
The system exhibited a wide range of complex dynamic patterns.

Conclusions:

Simple physiological feedback loops can explain complex hormone release patterns.
Coupling between circulatory hormones and production centers may drive observed in vivo pulsatility.
This model provides a framework for understanding the origins of complex endocrine dynamics.