Differentiate between sympathetic and para sympathetic nervous system?

The sympathetic nervous system regulates the body's "fight or flight" response. It releases Norepinephrine (NE), which increases heart rate and the contraction strength of the heart among other things. This gets the body prepared for action The parasympathetic nervous system, on the other hand, relaxes the body.It does this by slowing down the heart rate by releasing Acetylcholine (ACh).

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