All preganglionic and postganglionic parasympathetic nerve fibers are stimulated by the neurotransmitter ___________________

a. Epinephrine
b. Norepinephrine
c. Acetylcholine
d. Dopamine

c
Rationale: a. Epinephrine is a hormone released by the adrenal medulla.
b. Norepinephrine is a neurotransmitter of postganglionic sympathetic nervous tissue.
c. Correct.
d. Dopamine is thought to cause dilation of the renal, coronary, and cerebral arteries.