Biology 0610 · IGCSE · Sense organs

Sense organs — practice question

Which changes take place in the iris of the eye when a person moves from a brightly lit area into a dimly lit area?

  • Acircular muscles contract; radial muscles contract
  • Bcircular muscles contract; radial muscles relax
  • Ccircular muscles relax; radial muscles contract
  • Dcircular muscles relax; radial muscles relax

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