Question: what is acetylcholine and norepinephrine?
Answer: Acetylcholine is the primary neurotransmitter of both sympathetic and parasympathetic preganglionic neurons. ... The postganglionic effects of autonomic ganglion cells on their smooth muscle, cardiac muscle, or glandular targets are mediated by two primary neurotransmitters: norepinephrine (NE) and acetylcholine (ACh).