Biology 5090 · O Level · Mammalian sense organs

Mammalian sense organs — practice question

A person is reading a book in low light. Which row shows the condition of the eye muscles?

  • Aciliary muscles contracted; iris circular muscles contracted; iris radial muscles relaxed
  • Bciliary muscles contracted; iris circular muscles relaxed; iris radial muscles contracted
  • Cciliary muscles relaxed; iris circular muscles contracted; iris radial muscles relaxed
  • Dciliary muscles relaxed; iris circular muscles relaxed; iris radial muscles contracted

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