Neurotransmitters can be either excitatory or inhibitory. Which of the following neurotransmitters usually have an inhibitory effect on the post- synaptic cell?

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Quizplus · Accepted Answer

Gamma-aminobutyric acid (GABA) is an inhibitory neurotransmitter. It decreases the likelihood of the post-synaptic neuron firing by opening chloride channels, causing an influx of negatively charged chloride ions into the cell which makes the it more negative, which decreases the likelihood that the neuron will produce an action potential. The other options dopamine, acetylcholine, and glutamate are primarily excitatory neurotransmitters.

Neurotransmitters Can Be Either Excitatory or Inhibitory