A chemical that affects neuronal function but is not stored in presynaptic vesicles is ________.
A) acetylcholine
B) adrenaline
C) nitric oxide
D) gamma-aminobutyric acid (GABA)

Question

Quizplus · Accepted Answer

Nitric oxide is a gas that is produced by neurons on demand and rapidly diffuses through lipid membranes, affecting nearby cells. It functions as a signalling molecule and affects neuronal function without being stored in presynaptic vesicles. Acetylcholine and adrenaline are both stored in presynaptic vesicles and released upon neuronal activation. GABA is a neurotransmitter that is synthesized and stored in presynaptic vesicles.

A Chemical That Affects Neuronal Function but Is Not Stored