Question

what is the neurotransmitter that is secreted by all parasympathetic preganglionic neurons?
answers: a - e
a norepinephrine
b epinephrine
c acetylcholine
d dopamine
e calcium

Explanation:

Parasympathetic preganglionic neurons secrete acetylcholine. Norepinephrine and epinephrine are associated with sympathetic post - ganglionic neurons (except for some sympathetic cholinergic fibers). Dopamine is a neurotransmitter in other neural pathways (e.g., in the brain's reward system). Calcium is an ion involved in neurotransmitter release mechanisms but is not a neurotransmitter itself.

Answer:

C. Acetylcholine