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Related Concept Videos

Feedback Loops01:01

Feedback Loops

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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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Positive and negative feedback loops are crucial for regulating biological signaling systems. These feedback loops are processes that connect output signals to their inputs.
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Feedback control systems01:26

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Feedback control systems are categorized in various ways based on their design, analysis, and signal types.
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Control systems are foundational elements in automation and engineering. They are broadly categorized into open-loop and closed-loop systems. These classifications hinge on the presence or absence of feedback mechanisms, significantly influencing the system's performance, complexity, and application.
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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!
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Related Experiment Video

Updated: Jan 28, 2026

Control of Eating Behavior Using a Novel Feedback System
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A Feedback Loop Controlling Organ Size.

Allyson J Merrell1, Ben Z Stanger1

  • 1Departments of Medicine and Cellular and Developmental Biology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA.

Developmental Cell
|February 21, 2019
PubMed
Summary
This summary is machine-generated.

Nature uses communication systems to regulate organ size and maintain balance. A new enterohepatic feedback loop in the liver controls tissue size and function.

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Area of Science:

  • Organogenesis and tissue homeostasis
  • Mammalian physiology
  • Endocrinology and metabolism

Background:

  • Organ size is tightly regulated through complex biological mechanisms.
  • Trans-organ communication, involving paracrine and circulating factors, is crucial for maintaining homeostasis.
  • The liver, a vital organ, requires precise control of its size and function.

Purpose of the Study:

  • To elucidate the enterohepatic feedback loop regulating mammalian liver size.
  • To understand the communication systems balancing liver tissue size and function.
  • To identify novel regulatory factors involved in liver homeostasis.

Main Methods:

  • Investigated signaling pathways within the enterohepatic circulation.
  • Utilized genetic and molecular biology techniques in mammalian models.
  • Analyzed the impact of feedback loop disruption on liver size and function.

Main Results:

  • Identified a novel enterohepatic feedback loop critical for liver size control.
  • Demonstrated that this loop balances liver tissue size with its metabolic function.
  • Characterized key regulatory factors mediating the feedback mechanism.

Conclusions:

  • The enterohepatic feedback loop is essential for maintaining mammalian liver homeostasis.
  • This system represents a significant advance in understanding organ size regulation.
  • Findings provide insights into potential therapeutic targets for liver diseases.