CAIE IGCSE Biology 14.3.3 Adrenaline in Fight-or-flight Responses
Practise identifying adrenaline as the fight-or-flight hormone and predicting its effects on breathing, heart rate and pupils.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- identify adrenaline as the hormone released during fight-or-flight situations
- state that adrenaline increases breathing rate and heart rate
- state that adrenaline increases pupil diameter rather than causing constriction
14.3.3—Adrenaline as the hormone secreted question 1
[Maximum number: 2]
When a body senses danger, more adrenaline is secreted from the adrenal glands.
Describe two ways in which the hormone adrenaline affects the body in preparation for action.
1
2
Any two from:
heart beats faster / increased pulse;
increased rate of breathing;
stimulates breakdown of glycogen in the liver;
increases blood glucose concentration;
dilate pupils;
heightened sensitivity / increased mental awareness / owtte;
Marking guidance:
allow: sharper senses / more alert / owtte
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