The inhibitory neurotransmitters of the CNS,GABA and glycine,act by opening ________ channels. A) only Na⁺ B) only Cl^- C) only K⁺ D) only Ca²⁺ E) Na⁺ and K⁺

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Quizplus · Accepted Answer

GABA and glycine open Cl- channels, resulting in hyperpolarization of the postsynaptic neuron and inhibition of action potentials. This is achieved by increasing the flow of negatively charged Cl- ions into the neuron, making the membrane potential more negative and less likely to reach the threshold for firing an action potential. Therefore, choice B, which represents only Cl- channels, is the best choice. The other options are not relevant to the function of inhibitory neurotransmitters or do not reflect the type of ion channels opened by GABA and glycine.

The Inhibitory Neurotransmitters of the CNS,GABA and Glycine,act by Opening