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The sympathetic nervous system is responsible for maintaining fight-or-flight and alertness-related functions of the autonomic nervous system.

It's key neurotransmitter class, the catecholamines (dopamine, norepinephrine, and epinephrine) induce vasoconstriction (increasing blood pressure and shunting blood away from the skin in case of injury), increase heart rate (to supply more blood to the body), increase the breakdown of glycogen to glucose (to allow for more readily-available chemical energy for cells in a higher activity state), and control various other "alerting" or "stimulating" functions throughout the body.

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Does the sympathetic nervous system cause vasoconstriction?

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