Feedback mechanisms

Science

Definition

Biological control systems that maintain homeostasis or amplify a response. Negative feedback loops reverse a change to restore balance, while positive feedback loops amplify a change until a process is complete.

Examples

  • Thermostat-like regulation of body temperature (negative feedback)
  • Blood clotting cascade amplifying platelet response at a wound (positive feedback)
  • Insulin and glucagon regulating blood sugar levels (negative feedback)

Related Terms

Nervous system Immune system Cell transport Signal transduction

Study This Concept

Practice feedback mechanisms with free review games in these units:

AP Biology Unit 4: Cell Communication and Cell Cycle