Learning objective

Adrenaline is the hormone released during 'fight or flight' responses, which causes effects such as: (a) an increase in breathing rate (b) an increase in heart rate (c) an increase in pupil size.

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Exam focus

Cambridge IGCSE BiologyCoordination and responseCore content

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Quick explanation

This point belongs to Hormones, especially Hormones outcomes.
You need to be able to adrenaline is the hormone released during 'fight or flight' responses, which causes effects such as: (a) an increase in breathing rate (b) an increase in heart rate (c) an increase in pupil size.
The key ideas to know are Describe.
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Key concepts

Describe

Why it matters

This objective helps connect Hormones outcomes to exam-style questions, flashcards, and revision notes for Hormones.

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Paper 3Theory (Core)1 marks

Description

Adrenaline causes several changes in the body to prepare it for rapid action.

a
Describe one effect of adrenaline on the breathing rate.
Your answer
Aim for approximately 1 distinct marking point.
[1]

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