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Related Concept Videos

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:
Cell Signaling Feedback Loops01:07

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...
Effects of feedback01:24

Effects of feedback

Feedback in control systems plays a critical role in shaping various operational parameters, extending beyond simple error reduction to influence stability, bandwidth, gain, impedance, and sensitivity. Understanding these effects requires examining a basic feedback system characterized by defined input, output, error, and feedback signals.
Feedback significantly modifies the gain of a control system. The gain of a system without feedback is altered by a factor of one plus GH, where G represents...
Feedback Inhibition00:46

Feedback Inhibition

Biochemical reactions are occurring constantly in cells, converting starting substances to different products, usually with the help of enzymes that speed the reactions. Without enzymes, it would take far too long for most reactions to occur to be useful to the cell!
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...
Feedback Loops01:01

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.

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Related Experiment Video

Updated: Jun 15, 2026

The Use of Chemostats in Microbial Systems Biology
13:19

The Use of Chemostats in Microbial Systems Biology

Published on: October 14, 2013

A simplified model for explaining negative feedback to beginners in life sciences.

Masato Shibuya1, Yoshitaka Oku, Ikuo Homma

  • 1Department of Physiology, Kagawa Nutrition Junior College, Tokyo, Japan. mshibuya@eiyo.ac.jp

Advances in Experimental Medicine and Biology
|March 11, 2010
PubMed
Summary
This summary is machine-generated.

Explaining the opposing effects of carbon dioxide (CO2) and oxygen (O2) on respiration to beginners is challenging. A new diagram visually clarifies feedback mechanisms, illustrating how CO2 and O2 influence breathing differently.

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Area of Science:

  • Physiology
  • Respiratory System Regulation
  • Educational Methods

Background:

  • Conventional negative feedback diagrams struggle to illustrate opposing physiological effects.
  • Understanding the distinct impacts of carbon dioxide (CO2) and oxygen (O2) on respiration is crucial for beginners.
  • Effective visualization aids are needed to explain complex biological control systems.

Purpose of the Study:

  • To develop a novel diagram for clearly presenting the opposing effects of CO2 and O2 on respiration.
  • To simplify the explanation of negative feedback mechanisms in biological systems for educational purposes.
  • To provide a versatile visual tool for teaching respiratory regulation.

Main Methods:

  • Development of a new conceptual diagram illustrating feedback loops.
  • Inclusion of key components: cause, effect, facilitating/inhibiting factors (noises), magnitude, set-point, and feedback.
  • Utilizing directional representation of results (e.g., INCREASE/DECREASE) to denote opposing influences.

Main Results:

  • The new diagram effectively illustrates the cause-and-effect relationship in physiological regulation.
  • It clearly depicts how factors like CO2 and O2 can have opposite effects on respiration.
  • The model successfully incorporates concepts like set-point comparison and feedback modulation.
  • An analogy using engine RPM and speed is used to explain the diagram's components.

Conclusions:

  • The developed diagram offers a more intuitive way to teach the opposing roles of CO2 and O2 in respiration.
  • This visual aid enhances understanding of respiratory control mechanisms for novice learners.
  • The diagram's flexibility allows for broader application in explaining various feedback systems in biology.