CAIE IGCSE Biology 14.2.5 Pupil reflex in terms
Practise using circular and radial iris muscles to explain how antagonistic action changes pupil size in different light levels.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- apply circular and radial muscle states to make the pupil smaller or larger
- compare iris muscle contraction and relaxation in bright and dim light
- state antagonistic action for muscle pairs working in opposition in the iris
14.2.5—Pupil reflex in terms question 1
[Maximum number: 1]
The eye is a sense organ that is part of the nervous system.
State the names of the two effectors that contract and relax during the pupil reflex. and
circular muscle and radial muscle ;
A in either order
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