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This lesson covers the principles of homeostasis and the mechanism of negative feedback as required by the Edexcel A-Level Biology specification (9BI0), Topic 9 -- Control Systems. You need to understand what homeostasis is, why it is important, and how negative and positive feedback loops work.
Homeostasis is the maintenance of a constant internal environment despite changes in external conditions. It is the process by which the body keeps physiological parameters within narrow limits.
Key physiological parameters that are maintained by homeostasis include:
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