Norepinephrine and acetyl choli enables the sympathetic and parasympathetic divisions respectively to bring about opposing effects in most organs they impact.
Postganglionic neurons in the sympathetic division release norepinephrine and postganglionic neurons in the parasympathetic division release acetyl choli that bring opposing effects in most organs they impact.
Sympathetic system controls fight-or-flight responses and we can say that this system prepares the body for strenuous physical activity whereas the parasympathetic system regulates the rest and digest functions. But both the systems are divisions of the autonomic nervous system.
Ganglia for the sympathetic division are located outside the spinal cord and ganglia for the parasympathetic division are located near or in the organs they connect with.
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