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Related Concept Videos

What is Homeostasis?01:16

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...
Positive and Negative Feedback Loops01:18

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:
Homeostatic Imbalance01:10

Homeostatic Imbalance

Homeostasis is the maintenance of a stable internal environment within the body, which is crucial for the proper functioning of cells, tissues, organs, and organ systems. The body has various control mechanisms that work together to regulate various physiological parameters such as temperature, blood pressure, pH balance, and fluid balance, to name a few. These control mechanisms are based on feedback loops that can be either positive or negative.
However, sometimes these feedback loops fail,...
Hierarchy of Motor Control01:18

Hierarchy of Motor Control

The hierarchy of motor control refers to the different levels of organization and processing involved in controlling movement in the body. These levels range from higher cortical areas involved in planning and decision-making to lower spinal cord reflexes that respond automatically to external stimuli.
Primary Motives: Hunger and Thirst01:25

Primary Motives: Hunger and Thirst

Hunger and thirst are fundamental physiological drives crucial for maintaining homeostasis and ensuring the survival of both humans and animals. These drives are regulated through complex interactions between the brain, hormones, and sensory receptors.
Hunger arises when the brain detects changes in the body's nutrient levels, including glucose, lipids, amino acids, and hormones such as ghrelin and leptin. The hypothalamus plays a central role in hunger regulation. The lateral hypothalamus acts...
Homeostatic Imbalances in Body Temperature01:19

Homeostatic Imbalances in Body Temperature

Hyperthermia occurs when the body's temperature becomes unusually high, often due to heat exposure, intense physical activity, or certain illnesses. This condition can create a dangerous cycle where elevated body temperature increases the metabolic rate, generating more heat and potentially leading to organ failure and brain damage. A severe form of hyperthermia, called heat stroke, can raise body temperature to life-threatening levels. Fever, on the other hand, is a controlled form of...

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Related Experiment Video

Updated: May 16, 2026

Isolation of Targeted Hypothalamic Neurons for Studies of Hormonal, Metabolic, and Electrical Regulation
09:29

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A basic set of homeostatic controller motifs.

T Drengstig1, I W Jolma, X Y Ni

  • 1Department of Electrical Engineering and Computer Science, University of Stavanger, Stavanger, Norway.

Biophysical Journal
|December 4, 2012
PubMed
Summary
This summary is machine-generated.

Living systems use adaptation and homeostasis to maintain stability. This study details two-component controller motifs, inflow and outflow control, explaining robust homeostatic mechanisms against environmental changes.

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Area of Science:

  • Systems Biology
  • Biochemistry
  • Physiology

Background:

  • Homeostasis is crucial for life, yet reaction kinetic mechanisms for robust stability are poorly understood.
  • Environmental perturbations challenge cellular homeostasis, necessitating effective regulatory strategies.

Purpose of the Study:

  • To describe a complete set of two-component controller motifs for robust homeostasis.
  • To elucidate the operational modes and integration capabilities of these motifs within cellular systems.

Main Methods:

  • Analysis of reaction kinetic mechanisms.
  • Identification and classification of two-component controller motifs.
  • Physiological examples and pathway analysis.

Main Results:

  • A complete set of two-component controller motifs (inflow and outflow control) for robust homeostasis was identified.
  • These motifs can integrate uptake and metabolism, adapting to environmental changes.
  • Examples include altered microbial fermentation products and hormonal control systems.

Conclusions:

  • The described controller motifs provide a foundational understanding of robust homeostatic mechanisms.
  • Inflow and outflow control principles explain cellular adaptation and the integration of metabolic pathways.
  • These motifs offer insights into complex biological regulation, including hormonal systems.