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A control mechanism in which a change triggers responses that oppose the change and return a condition towards its normal level.

A control process in which a change triggers a response that opposes that change.

Insulin and glucagon have opposing effects: insulin lowers a high concentration, whereas glucagon raises a low one. This is negative feedback because each response opposes the change that triggered it. As blood glucose returns towards its usual range, the stimulus for that hormone's release is reduced; the two hormones do not simply switch on at one exact concentration.

A control process in which a departure from the normal level causes responses that oppose the change and restore conditions towards normal.

For negative feedback, state both the change detected and how the response opposes it. Glucagon is Higher Tier only.

For thyroxine negative feedback, explain both directions: low thyroxine increases TSH release, while high thyroxine reduces it.

To explain negative feedback, include both directions: low thyroxine increases stimulation, while thyroxine returning to its normal level inhibits TRH release and TSH production.

A control process in which a change triggers a response that opposes the change, helping to return a condition towards its normal level.

This pathway is an example of negative feedback. In negative feedback, a departure from the normal level causes a response that opposes the departure. The response therefore brings the condition back towards its normal level rather than driving it farther away.

A decrease in one process caused by the product or effect of that process, helping to regulate hormone concentrations.

A control process in which a change produces responses that oppose the original change.

A control mechanism in which a change produces responses that counteract that change and return a condition towards its normal level.

A control process in which a change triggers a response that counteracts that change.

This is negative feedback because the response opposes the original change. It works in both directions: it corrects a concentration that is too low as well as one that is too high. The concentration may fluctuate around a normal level rather than remaining perfectly fixed.

A control process in which a change produces responses that oppose or limit that change.

A control process in which a change produces responses that oppose the change and return a condition towards its normal range.

A control process in which a change triggers responses that counteract that change.

A control mechanism in which a change produces responses that oppose that change and return conditions towards their normal level.

A control mechanism in which a change triggers responses that oppose that change, returning a condition towards its normal level.

Hormone production is commonly regulated by negative feedback.

A control mechanism in which a change causes responses that oppose the original change, returning a condition towards its normal level.

A control process in which a departure from the normal range triggers responses that oppose the original change.

A control mechanism in which a change produces responses that oppose the original change and return a condition towards its normal range.

A control mechanism in which a change produces responses that oppose the original change and return a condition towards its normal level.

Control in which a change produces responses that oppose that change, helping to regulate hormone levels.

A control process in which a change produces responses that counteract the original change.

A control process in which a change triggers responses that oppose the change and return a condition towards its normal level.

Negative feedback

Definition

How each exam board covers it

AQA GCSE Biology · 8461

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Edexcel GCSE Biology · 1BI0

OCR GCSE Biology A · J247

OCR GCSE Biology B · J257