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GABA-gated Chloride Channel
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.
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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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A specific receptor complex on a neuron's membrane has a primary binding site for a neurotransmitter that, when bound, opens a channel allowing negative ions to flow into the cell. This complex also has a separate, distinct binding site. A new drug is developed that binds only to this separate site. When this drug is bound, the channel opens more easily and for a longer duration in the presence of the primary neurotransmitter. What is the most likely overall effect of this new drug on the neuron?
A new experimental drug is found to bind to a receptor complex on a neuron's membrane. This binding action opens an integrated channel, allowing a significant influx of negatively charged chloride ions (Cl-) into the cell. Based on this specific mechanism, what is the most likely effect of this drug on the neuron's activity?