When a nerve cell is stimulated, it triggers the release of the neurotransmitter ligands. These then bind to the gated channel, allowing it to open. The flow of ions into the cell is what propagates the nerve signal.

This describes a type of ______.

Question

When a nerve cell is stimulated, it triggers the release of the neurotransmitter ligands. These then bind to the gated channel, allowing it to open. The flow of ions into the cell is what propagates the nerve signal.

This describes a type of ______.

BlackTom AI · Accepted Answer

Let’s break down what’s described and examine each option in turn.
First, the scenario mentions a neurotransmitter being released and binding to a channel, which then opens to allow ions to flow into the cell, propagating the nerve signal. This pattern is characteristic of channels that are directly gated by a chemical messenger (the ligand).
Option 1: 'ligand-gated ion channel' — This matches the description precisely: a channel opened by binding of a ligand (neurotransmitter) leading to ion influx and signal transmission. It correctly describes the mechanism as chemical (ligand) binding controlling the channel.
Option 2: 'voltage-gated ion channel' — These channels respond to changes in membrane potential, not to a chemical binding event by a neurotransmitter. Since the description emphasizes ligand binding rather than voltage, this option doesn’t fit.
Option 3: 'membrane potential' — This term refers to the electrical potential difference across the cell membrane, not a type of channel or a mechanism by which channels open. It’s a consequence of ion movement, not the gating mechanism described.
Option 4: 'receptor tyrosine kinase' — This is a class of receptors that activate intracellular signaling cascades via phosphorylation and do not function as ion channels that open to allow ion flow. The described direct ion flow through a channel gated by a ligand points away from a kinase receptor.
In summary, the key feature here is the direct coupling between ligand binding and opening of an ion channel, which is emblematic of ligand-gated ion channels, while the other options involve different gating mechanisms or receptor types that don’t match the described process.

When a nerve cell is stimulated, it triggers the release of the neurotransmitter ligands. These then bind to the gated channel, allowing it to open. The flow of ions into the cell is what propagates the nerve signal. This describes a type of ______.单项选择题

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