Acetylcholine released into the junction between a motor neuron and a skeletal muscle binds to a sodium/potassium channel and opens it. This is an example of ________.

Question

BlackTom AI · Accepted Answer

When examining how acetylcholine operates at the neuromuscular junction, several possibilities come to mind about channel types.
Option 1: 'a chemical that inhibits action potentials' describes a molecule that would reduce excitability, not a channel opening mechanism. It does not specify a type of ion channel and mischaracterizes the role of acetylcholine in this synapse.
Option 2: 'a ligand-gated channel' correctly identifies the mechanism: acetylcholine acting as a ligand binds to a receptor that directly gates the channel, allowing Na+ (and sometimes Ca2+) to pass and depolarize the muscle membrane.
Option 3: 'a voltage-gated channel' would open in response to changes in membrane potential, not directly in response to a chemical messenger binding. This description does not match how acetylcholine influences the postsynaptic membrane at the motor end plate.
Option 4: 'a second-messenger-gated channel' implies opening via intracellular signaling cascades triggered by receptors that are not themselves ion channels. In the neuromuscular junction, the receptor-channel is itself an ion channel that opens directly upon ligand binding, rather than via a second messenger system.
Overall, the key distinction is whether the signal directly gates the channel (ligand-gated) versus requiring voltage changes or intracellular messengers; the acetylcholine effect here is a direct ligand-gated channel opening, leading to depolarization of the muscle cell.

Bio 93 Section CDE 2025 Final Exam Practice, Part 1

Acetylcholine released into the junction between a motor neuron and a skeletal muscle binds to a sodium/potassium channel and opens it. This is an example of ________.

查看解析

登录即可查看完整答案

类似问题

The membrane receptor on the dendrite that receives the neurotransmitter is a type of ______.

Ion channels located on the plasma membrane of a muscle, which open in response to binding of acetylcholine, are an example of a:

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 ______.

Using the analogy of an office key opening an office door to describe the action of chemical messengers on an ion channel, which of the following would be equivalent to inserting the correct key into the lock?

Ligand gated ion channels can be found:

Which go together?

In a consumer society, many adults channel creativity into buying things

Economic stress and unpredictable times have resulted in a booming industry for self-help products

更多留学生实用工具

考试浏览器助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单