Sympathetic nervous system and the parasympathetic nervous system?

Sympathetic Nervous System:If you think of it as "fight or flight" it becomes a lot easier to remember how it works. It increases the heart rate, increases energy production, decreases the GI system...

The autonomic nervous system.Both are divisions of the autonomic nervous system.

The autonomic nervous system.

autonomic

autonomic nervous system. SNS uses noradrenaline or adrenaline, PSNS uses Acetylcholine (ACh)