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The maintenance of a stable internal environment despite internal or external changes.

The regulation of the internal conditions of a cell or organism to maintain optimum conditions for function in response to internal and external changes.

Homeostasis is the regulation of internal conditions in response to such internal and external changes, maintaining optimum conditions for enzyme action and other cell functions. It does not mean that every condition stays at one exact value at all times; a change can be detected and corrected.

Define homeostasis as regulation of the internal conditions of a cell or organism, not simply keeping the body unchanged.

Do not say that homeostasis keeps the external environment constant. It regulates conditions inside the body despite changes inside or outside it.

Do not describe homeostasis as keeping conditions perfectly fixed. State that it keeps internal conditions within suitable limits or a narrow range.

Homeostasis is the regulation of this internal environment so that conditions remain suitable for normal cell function. It does not mean that every value is perfectly fixed. Conditions fluctuate, but control systems keep them within narrow ranges around an optimum.

The regulation of internal conditions within a suitable range despite changes inside or outside the body.

The regulation of internal conditions within suitable limits despite internal or external changes.

The regulation of an organism’s internal conditions so that they remain within suitable limits for healthy cell function.

Homeostasis is the regulation of these internal conditions so that they remain within suitable limits despite internal and external changes.

Maintenance of a relatively stable internal environment despite internal or external changes.

The maintenance of a stable internal environment within a narrow range, despite internal and external changes.

Homeostasis is the maintenance of a stable internal environment within a narrow range, despite internal and external changes. It does not keep every condition at one perfectly fixed value; small fluctuations around a suitable level are normal.

The maintenance of a stable internal environment within narrow limits despite internal or external changes.

The maintenance of conditions inside a cell or organism within a narrow range suitable for cells, enzymes and life processes.

The regulation of internal conditions so that cells and enzymes can function within a suitable range.

Homeostasis

Definition

How each exam board covers it

AQA GCSE Biology · 8461

Edexcel GCSE Biology · 1BI0

Exam tips

Revise Biology with GradeGen

OCR GCSE Biology A · J247

OCR GCSE Biology B · J257