Which statement concerning neurotransmitter release at the effector is true?

a. Preganglionic parasympathetic neurons release serotonin.
b. Preganglionic sympathetic neurons release norepinephrine.
c. Postganglionic parasympathetic neurons release norepinephrine.
d. Postganglionic sympathetic neurons release acetylcholine.
e. Postganglionic sympathetic neurons release norepinephrine.


e

Biology & Microbiology

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Abscisic acid stimulates the abscission of leaves

____________________ Indicate whether the statement is true or false.

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