# Describe the effects of adrenaline on the body during a 'fight or flight' response.

> Cambridge International IGCSE Biology (0610) — 14.3 Hormones · Describe · 4 marks

## Mark scheme (4 marks)

1. Adrenaline increases heart rate
2. Adrenaline increases breathing rate
3. Adrenaline widens / dilates the pupils
4. Adrenaline increases blood glucose concentration by converting glycogen to glucose in the liver

## Key terms

- [adrenaline](https://www.gradenine.co.uk/glossary/adrenaline)

## Related

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Source: [GradeNine](https://www.gradenine.co.uk/q/describe-the-effects-of-adrenaline-on-e1794564) · Published by Druglandscape Ltd.