Final answer:
The neurotransmitter at all synapses and neuroeffector junctions in the parasympathetic division of the ANS is acetylcholine (ACh).
Step-by-step explanation:
The neurotransmitter at all synapses and neuroeffector junctions in the parasympathetic division of the ANS is acetylcholine (ACh). Acetylcholine is released by the postganglionic parasympathetic fibers and binds to muscarinic receptors on their target cells.
This neurotransmitter triggers depolarization and plays a crucial role in regulating various bodily functions like digestion, urination, and salivation. In contrast, the postganglionic sympathetic fibers release norepinephrine in most cases.