Question

question 23
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the pupils dilate in dark conditions in an effort to allow more light to stimulate
the retina.
this compensatory pupillary dilation is primarily due to which of the
following?
referred pain
sympathetic input
somatic reflex
parasympathetic input

Explanation:

The sympathetic nervous system is responsible for the "fight - or - flight" response. One of its functions is to dilate the pupils (mydriasis) in low - light conditions to allow more light to enter the eye and stimulate the retina. Referred pain is the perception of pain in an area distant from the actual source of the pain. Somatic reflexes are reflexes involving the skeletal muscles. The parasympathetic nervous system is responsible for the "rest - and - digest" response and causes pupil constriction (miosis).

Answer:

Sympathetic Input