Biology 0610 · IGCSE · Sense organs

Sense organs — practice question

In a bright-light pupil reflex, which description best matches the way the iris muscles act?

  • AThe circular muscles of the iris contract and the radial muscles relax.
  • BThe circular muscles of the iris contract and the radial muscles contract.
  • CThe circular muscles of the iris relax and the radial muscles contract.
  • DThe circular muscles of the iris relax and the radial muscles relax.

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