The diameter of the pupils is regulated by th | vedclass

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(A) The iris is the visible colored part of the eye that surrounds the pupil. It contains two sets of smooth muscle fibres: the circular sphincter pup

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Iris

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(A) The iris is the visible colored part of the eye that surrounds the pupil. It contains two sets of smooth muscle fibres: the circular sphincter pupillae and the radial dilator pupillae. These muscles contract and relax to adjust the size of the pupil,thereby regulating the amount of light entering the eye.

The diameter of the pupils is regulated by the muscle fibres of ...........

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