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Chemically-gated ion channels are receptor membrane proteins that are permeable to specific ions. The 'gating' part of it refers to the channel being open only once activated; which in this case will be by a chemical. An example would be the AMPA glutamate receptor, which has a channel pore that is permeable to sodium ions. Only by binding to glutamate (a neurotransmitter) does the channel allow sodium ions to enter the cell.
Jazlyn Hoppe
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What is a stimulus gated channel?
There are voltage-gated ion channels and ligand-gated ion channels, and since both are stimuli the term stimulus-gated is a redundancy.
What three stimuli open and close gated channels?
Change in the voltage across the membrane, ligand binding, and mechanical stress.
What are channels of production?
Voltage Gated channels
Which type of membrane channels are found at the axon?
Voltage-gated Na+ and voltage-gated K+ channels
What changes occur to voltage-gated Na and K channels at the peak of depolarization?
Inactivation gates of voltage-gated Na+ channels close, while activation gates of voltage-gated K+ channels open.
Which ion channel opens in response to a change in membrane potential and participates in the generation and conduction of action potentials?
Sodium channels. A neuron's membrane potential may depolarize for many reasons (neurotransmitters, mechanical deflection, electrical synapse, etc). When that membrane depolarizes to the point of its threshold of activation, then voltage gated channels open up an allow an influx of sodium into the cell. This rapidly depolarizes the cell's membrane, causing that upward peak or rising phase to occur.
What is a gated channel?
It is a channel through a membrane that can be opened or closed by chemical or electrical events.
Protein channels that are sensitive to electricity are known as WHAT channels?
Voltage Gated channels
Are all the gated calcium channels concentrated at the nodes of ranvier of myelinated axons?
no, most gated mandiable channels are concentrated at the nodes of ranvier of myelinated axons.
Where are mechanically gated channels found?
cell membrane
What is happening to the voltage gated channels at this point in the action potential?
Na+ channels are inactivating, and K+ channels are opening.
What is happening to voltage-gated channels at this point in the action potential?
Na+ channels are inactivating, and K+ channels are opening.
