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

Question

BlackTom AI · Accepted Answer

Question restatement: The scenario describes ion channels on the muscle cell plasma membrane that open when acetylcholine binds to them, which is a ligand-based trigger.
Option 1: 'sodium-potassium pump' — This is a transporter that uses active transport to move Na+ and K+ across the membrane, not a channel that opens in response to a chemical signal. It does not fit the description of a channel gated by ligand binding. This choice mislabels an enzyme/transporter as a gated channel.
Option 2: 'mechanically-gated ion channel' — These channels respond to mechanical deformation (such as stretch or pressure) of the membrane, not to chemical binding. Since the stimulus is chemical (acetylcholine), this option does not match.
Option 3: 'voltage-gated ion channel' — Voltage-gated channels open in response to changes in membrane potential (voltage), not to ligand binding. The trigger described is chemical, so this option is incorrect.
Option 4: 'ligand-gated ion channel' — This type of channel opens when a ligand, such as acetylcholine, binds to its receptor, allowing ion flow across the membrane. This directly aligns with the given scenario and is the correct mechanism described.
Option 5: 'leak channel' — Leak channels are typically always open and are not gated by ligand binding or voltage or mechanical stimuli. They do not respond specifically to acetylcholine binding, so this choice does not fit the description.
In summary, each incorrect option either describes a transporter (not a channel), or a gate mechanism that relies on mechanical, voltage, or constitutive openness rather than ligand binding. The correct mechanism is the ligand-gated ion channel, which opens upon acetylcholine binding to its receptor on the muscle cell membrane.

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

Similar Questions

Which one of the following is characteristic of the events occurring at an excitatory synapse?

Which one of the following statements about ligand-gated ion channels is CORRECT?

Nicotinic acetylcholine (Ach) receptors mediate synaptic transmission at the neuromuscular junction and are an example of .

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 ________.

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

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:

More Practical Tools for Students Powered by AI Study Helper

Homework AI Solver

Stylized AI Paper Writer

Plagiarism Checker Assistant

Citation AI Academic Writing Tool

In-Class Translation Assistant

AI Note Generator

AI Quiz Answers

Past Exam Questions from University Test Bank

Smart Practice Assistant

Adaptive Practice

Making Your Study Simpler