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Depressants, such as alcohol, barbiturates, and benzodiazepines, function as agonists of the gamma-Aminobutyric acid (GABA) neurotransmitter system, producing a quieting effect on the brain. Their primary site of action is the GABA-gated chloride (Cl–) channel, which has multiple distinct receptor sites. These sites can bind not only to depressant drugs but also to GABA itself and to neurosteroids.

Depressants Mechanism of Action

The GABA-gated chloride channel is a receptor complex in the cell membrane that features multiple, distinct binding sites for various molecules. Each site has a specific shape corresponding to a particular substance, such as GABA, barbiturates, benzodiazepines, alcohol, or neurosteroids. When these substances bind, the channel opens, allowing negatively charged chloride ions (Cl-) to enter the neuron, which contributes to the inhibitory or 'quieting' effect on the brain.

GABA-gated Chloride Channel

A patient is administered a drug from the depressant class, resulting in a significant quieting of brain activity. Which of the following statements provides the most accurate neurochemical explanation for this effect?

A new medication is designed to treat severe anxiety. Its primary function is to increase the activity of the gamma-Aminobutyric acid (GABA) neurotransmitter system. Based on this mechanism, what is the most direct consequence at the neuronal level when this drug is active?

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