Biology 0610 · IGCSE · Sense organs

Sense organs — practice question

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

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

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