Explain the function of the pupil and of the iris, Biology

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Q. What is the function of the pupil and of the iris?

The iris works like the diaphragm of a photographic camera since it has muscles that relax or contract varying the pupil diameter. When the luminous intensity heightens the parasympathetic nervous system commands the contraction of the pupil when there is shortage of light the sympathetic nervous system stimulates the dilation of the pupils these movements depend upon the muscles of the iris.


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