Biology 5090 · O Level · Mammalian sense organs

Mammalian sense organs — practice question

If a bright light is directed into the eye, the pupil contracts. Which statement explains this reaction?

  • ACiliary muscles in the eye contract.
  • BCircular muscles in the iris contract.
  • CSensory cells in the iris detect the bright light.
  • DSensory neurones stimulate the ciliary muscles in the iris.

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