The sympathetic nervous system uniquely regulates pupil size by dilating the pupil to allow more light to enter during fight-or-flight responses.
The sympathetic nervous system's uniquely sympathetic function is the regulation of pupil size. This system is responsible for dilating the pupil to allow more light to enter the eye, especially during fight-or-flight responses.
On the other hand, the parasympathetic nervous system constricts the pupil. This control of pupillary size is a clear example of the delicate balance between these two divisions of the autonomic system.
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