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Feedback Inhibition

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!

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.

Internal Receptors

Internal Receptors

Many cellular signals are hydrophilic and therefore cannot pass through the plasma membrane. However, small or hydrophobic signaling molecules can cross the hydrophobic core of the plasma membrane and bind to internal, or intracellular, receptors that reside within the cell. Many mammalian steroid hormones use this mechanism of cell signaling, as does nitric oxide (NO) gas.

Proofreading

Proofreading

Cross-reactivity

Cross-reactivity

Allergic Reactions

Allergic Reactions

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Related Experiment Video

Updated: Mar 22, 2026

Studying Aggression in Drosophila fruit flies

Studying Aggression in Drosophila fruit flies

Published on: February 25, 2007

The authors reply

Deena Kelly Costa¹, David J Wallace, Jeremy M Kahn

¹Department of Systems, Populations and Leadership, School of Nursing, University of Michigan, Ann Arbor, MI, and Institute for Healthcare Policy and Innovation, University of Michigan, Ann Arbor, MI Department of Critical Care Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, PA Department of Critical Care Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, PA, and Department of Health Policy and Management, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA.

Critical Care Medicine

|April 16, 2016

Summary

No abstract available in PubMed .

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