Why does your pupil contract and relax

1.	Why does your pupil contract and relax
Answer» Explanation: In order to regulate the light levels ENTERING the eye, the SIZE of the pupil is adjusted by the iris. ... In bright light, the CIRCULAR muscles CONTRACT whilst the radial muscles relax. This causes the pupil to constrict and less light enters the eye. In dim CONDITIONS the opposite occurs.

Answer»

Explanation:

In order to regulate the light levels ENTERING the eye, the SIZE of the pupil is adjusted by the iris. ... In bright light, the CIRCULAR muscles CONTRACT whilst the radial muscles relax. This causes the pupil to constrict and less light enters the eye. In dim CONDITIONS the opposite occurs.

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Why does your pupil contract and relax

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