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

Question

Quizplus · Accepted Answer

Nitric oxide is a gas that diffuses rapidly across membranes and does not require storage in presynaptic vesicles. It affects neuronal function by regulating blood flow to the brain, modulating neurotransmitter release, and contributing to synaptic plasticity. Acetylcholine, epinephrine, and GABA are neurotransmitters that are stored in presynaptic vesicles before release.

A Chemical That Affects Neuronal Function but Is Not Stored