Answer
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Because It raises the action potential threshold, which makes it more difficult for an excitatory neurotransmitter to stimulate the neuron. in order to reach the level where an action potential can occur, a higher depolarization is needed.
GABA's inhibitory function essentially lowers the neuron's overall excitability, making it less likely to react to subsequent excitatory inputs from other neurons. As a result of its ability to lessen or inhibit the firing of brain cells, GABA is regarded as an inhibitory neurotransmitter.
