A neurotransmitter may be excitatory at one synapse and inhibitory at another.

Question

Quizplus · Accepted Answer

Neurotransmitters can have different effects depending on the receptor they bind to and the type of neuron they are interacting with. For example, glutamate is usually excitatory, but can also act as an inhibitory neurotransmitter in certain types of neurons. Similarly, GABA is typically inhibitory, but can have excitatory effects in certain circumstances. Therefore, a neurotransmitter can be both excitatory and inhibitory depending on the synapse it acts on.

A Neurotransmitter May Be Excitatory at One Synapse and Inhibitory