When the girl opens her eyes in a brightly lit room, her pupils shrink because the muscles contract. In bright light conditions, the muscles in the iris (the circular muscles known as the sphincter pupillae) contract to reduce the size of the pupils, thereby limiting the amount of light that enters the eye. This response helps to protect the retina from excessive brightness and improve visual acuity.
A girl has her eyes shut and is standing inside a brightly lit room. What happens to her pupils when she opens her eyes? Why?
Responses
Her pupils grow because the muscles relax.
Her pupils grow because the muscles relax.
Her pupils grow because the muscles contract.
Her pupils grow because the muscles contract.
Her pupils shrink because the muscles relax.
Her pupils shrink because the muscles relax.
Her pupils shrink because the muscles contract.
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