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What is a sympathetic nervous system?

What is a sympathetic nervous system? Here are some definitions.

Noun
  1. (neuroanatomy) The part of the autonomic nervous system that raises blood pressure and heart rate, constricts blood vessels, and dilates the pupils when under stress.
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Examples
Drugs can modulate the activity of the sympathetic nervous system by affecting the synthesis, storage, release or reuptake of noradrenaline.
The sympathetic nervous system, not white blood cells, is critically important in the regulation of energy expenditure and thermogenesis.
Too much sympathetic nervous system activity can be associated with stress, anxiety, and dysphoric mood.
They also subdue signals from the sympathetic nervous system and inhibit deleterious overgrowth of damaged heart muscle.
Ganglioneuroma is a benign tumor of the sympathetic nervous system that rarely produces symptoms of endocrine dysfunction.
Here we will activate your sympathetic nervous system using a famous model pain stimulus: dunking your hand in ice water.

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