Dilation of pupil is the function of ______ nervous system.

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Solution

The sympathetic Nervous System is a component of the autonomic nervous system situated in the spinal cord near the thoracic and lumbar regions.
Its major role is to activate the fight or flight response in the body and it accomplishes this by controlling the heart rate, respiratory rate, pupillary response, and other factors.
By directing the circular muscles in the eye, the sympathetic nervous system drives the dilatation (widening) of the pupil.
And the parasympathetic nervous system narrows the pupil.
Final Answer: Dilation of the pupil is the function of the sympathetic nervous system.

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