# Explain how the hormone adrenaline prepares the body for a 'fight or flight' response during a stressful situation.

> Edexcel A-Level Biology A: Salters-Nuffield (9BN0) — 4.5 Hormonal coordination · Explain · 5 marks

> A student is about to sit an important exam. As they wait outside the exam hall, they notice their heart is beating faster and they feel more alert than usual.

## Mark scheme (5 marks)

1. Adrenaline is released from the adrenal glands
2. Adrenaline increases heart rate / causes the heart to beat faster
3. More blood / oxygen / glucose is delivered to muscles
4. Adrenaline increases blood glucose concentration / causes glycogen to be converted to glucose
5. This provides more energy / enables faster respiration in muscles so the body is prepared to respond quickly (fight or flee)

## Key terms

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

## Related

- [Revision notes for Edexcel A-Level Biology A: Salters-Nuffield (9BN0)](https://www.gradenine.co.uk/learn)
- [How to answer "Explain" questions](https://www.gradenine.co.uk/tools/command-word-cheatsheet)
- [Practice this with AI marking (free)](https://www.gradenine.co.uk/start)

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Source: [GradeNine](https://www.gradenine.co.uk/q/explain-how-the-hormone-adrenaline-prepares-5d13dd82) · Published by Druglandscape Ltd.