Acetylcholine is the main neurotransmitter released by
A. preganglionic sympathetic neurons and motor neurons.
B. preganglionic sympathetic neurons and cells of the adrenal medulla.
C. motor neurons and postganglionic sympathetic neurons.
D. preganglionic sympathetic neurons and postganglionic sympathetic neurons.
E. cells of the adrenal medulla and postganglionic parasympathetic neurons.
Answer: A
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