When activated, the sympathetic nervous system produces all of the following effects, EXCEPT:

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Multiple Choice

When activated, the sympathetic nervous system produces all of the following effects, EXCEPT:

Explanation:
Sympathetic activation drives fight-or-flight responses: it speeds the heart, redirects blood toward vital organs and muscles, dilates the bronchioles, and enlarges the pupil. Among these, pupil dilation is produced by the sympathetic system through the radial iris muscle, while pupil constriction is caused by parasympathetic input to the iris sphincter muscle. So, pupillary constriction would not be produced by activating the sympathetic system, making it the exception. The other listed effects—increased heart rate, shunting blood to vital organs, and bronchodilation—are all typical sympathetic responses.

Sympathetic activation drives fight-or-flight responses: it speeds the heart, redirects blood toward vital organs and muscles, dilates the bronchioles, and enlarges the pupil. Among these, pupil dilation is produced by the sympathetic system through the radial iris muscle, while pupil constriction is caused by parasympathetic input to the iris sphincter muscle. So, pupillary constriction would not be produced by activating the sympathetic system, making it the exception. The other listed effects—increased heart rate, shunting blood to vital organs, and bronchodilation—are all typical sympathetic responses.

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