# Explain how the body uses a negative feedback system to restore normal blood glucose levels after a person eats a meal containing a large amount of carbohydrates.

> OCR GCSE Biology A: Gateway Science (J247) — B3.3 Maintaining internal environments · Explain · 4 marks

> After eating a large carbohydrate-rich meal, a person's blood glucose concentration rises above the normal level. The body must respond to restore the stable internal environment.

## Mark scheme (4 marks)

1. The pancreas detects the rise in blood glucose concentration
2. The pancreas releases insulin into the bloodstream
3. Insulin causes glucose to be converted into glycogen (stored in the liver / muscles), lowering blood glucose concentration
4. This is a negative feedback system because the response reverses / opposes the original change, restoring the normal blood glucose level (homeostasis)

## Key terms

- [negative feedback system](https://www.gradenine.co.uk/glossary/negative-feedback-system)

## Related

- [Revision notes for OCR GCSE Biology A: Gateway Science (J247)](https://www.gradenine.co.uk/learn)
- [How to answer "Explain" questions](https://www.gradenine.co.uk/tools/command-word-cheatsheet)
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Source: [GradeNine](https://www.gradenine.co.uk/q/explain-how-the-body-uses-a-4a30b7cc) · Published by Druglandscape Ltd.