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  4. Dilation of pupil of human eye is caused by the

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Q. Dilation of pupil of human eye is caused by the

UP CPMTUP CPMT 2006

Solution:

Sympathetic nervous system dilates the pupils therefore permitting more light to enter into the eyes. Sympathetic nervous system included a chain of sympathetic ganglia. Parasympathetic nervous system constricts the pupil. It is the division of autonomic nervous system which is meant for maintaining daily or vegetative activities of different parts of body without consulting the will of the animal.