The size of the pupil is ______ by the sympathetic division of the autonomic nervous system and ______ by the parasympathetic division.Multiple choice question.not regulated; is regulatedregulated only; not at allincreased; decreaseddecreased; increased
Question
The size of the pupil is ______ by the sympathetic division of the autonomic nervous system and ______ by the parasympathetic division.Multiple choice question.not regulated; is regulatedregulated only; not at allincreased; decreaseddecreased; increased
Solution
The correct answer is "increased; decreased". The sympathetic division of the autonomic nervous system is responsible for the dilation (increase in size) of the pupil, a response often associated with 'fight or flight' situations. On the other hand, the parasympathetic division is responsible for the constriction (decrease in size) of the pupil, which is associated with 'rest and digest' situations.
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