Question

neurotransmitters of the parasympathetic nervous system
what neurotransmitter is the primary neurotransmitter released from post - ganglionic parasympathetic neurons?
acetylcholine
noradrenalin
adrenaline
serotonin

Explanation:

The parasympathetic nervous system is part of the autonomic nervous system. Post - ganglionic parasympathetic neurons release acetylcholine. Noradrenaline (also known as norepinephrine) is mainly associated with the sympathetic nervous system (post - ganglionic sympathetic neurons in some cases). Adrenaline (epinephrine) is released from the adrenal medulla. Serotonin is a neurotransmitter involved in various functions like mood regulation, but it is not the primary neurotransmitter of post - ganglionic parasympathetic neurons.

Answer:

Acetylcholine