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Edexcel ·Biology·Cambridge AS & A Level Biology

Homeostasis

17 min read

Negative feedback, the kidney and osmoregulation, blood-glucose control, and control of stomata.

Homeostasis and negative feedback

Homeostasis is the maintenance of a constant internal environment. It relies on negative feedback: a receptor detects a deviation, a coordinator processes it, and an effector returns the value toward the set point. A stable internal environment keeps enzymes near their optimum and cells independent of external change.

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