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Cambridge IGCSE Biology practice

Which muscles contract to make the pupil smaller in bright light?

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Show answerSense organs revisionRevise the key idea

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MCQ

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cambridge_mcq

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Topic

Sense organs

Exam-style question

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Which muscles contract to make the pupil smaller in bright light?.

  1. A.Radial muscles
  2. B.Circular muscles
  3. C.Ciliary muscles
  4. D.Optic muscles

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Paper 4 structured question: Sense organs

Paper 4Theory (Extended)4 marks

Diagram Description

Diagram of the iris muscles

The diagram shows the circular muscles arranged in a ring around the pupil and the radial muscles arranged like spokes radiating outward from the pupil.

  1. a

    Explain how the circular and radial muscles in the iris work together to control the size of the pupil in different light conditions.

    Aim for approximately 4 distinct marking points.

    [4]