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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.

Allergic Reactions

Allergic Reactions

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!

Cross-reactivity

Cross-reactivity

Mate Choice

Mate Choice

Mate choice—the decision about whom to mate with—is a type of natural selection, since animals must reproduce to pass down their genes. Mate choice is also called intersexual selection because the behavior occurs between the sexes.

Life Histories

Life Histories

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Related Experiment Video

Updated: Apr 26, 2026

Reaggregate Thymus Cultures

Reaggregate Thymus Cultures

Published on: August 28, 2008

Five authors reply

Usama Bilal¹, Esteve Fernández², Ana Navas-Acien³

¹Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD Social and Cardiovascular Epidemiology Research Group, School of Medicine, University of Alcalá, Madrid, Spain.

American Journal of Epidemiology

|July 27, 2014

Summary

No abstract available in PubMed .

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