A Chemical That Affects Neuronal Function but is Not Stored

Question

A chemical that affects neuronal function but is not stored in presynaptic vesicles is
A)acetylcholine.
B)epinephrine.
C)endorphin.
D)nitric oxide.
E)GABA.

Accepted Answer

Nitric oxide is a gas that is synthesized by neurons in response to certain stimuli and acts as a neurotransmitter by diffusing across cell membranes rather than being stored in vesicles.