The cell membrane immediately adjacent to an action potential depolarizes because ofMultiple ChoiceMembrane receptorsMembrane permeabilitySodium ionsLocal currents
Question
The cell membrane immediately adjacent to an action potential depolarizes because ofMultiple ChoiceMembrane receptorsMembrane permeabilitySodium ionsLocal currents
Solution
The cell membrane immediately adjacent to an action potential depolarizes because of Local currents.
Here's a step-by-step explanation:
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An action potential is initiated at a specific point along the neuron, usually the axon hillock. This is where the neuron's cell body transitions into the axon.
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When an action potential occurs, there is a rapid influx of sodium ions into the cell. This causes the inside of the cell to become more positive relative to the outside, a state known as depolarization.
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This change in voltage causes nearby voltage-gated sodium channels to open. Sodium ions then rush into the cell at these points, causing them to also depolarize. This is the local current.
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The local current is essentially a wave of depolarization that travels along the neuron. It's the movement of this wave that allows the action potential to propagate down the neuron.
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Therefore, the cell membrane immediately adjacent to an action potential depolarizes because of these local currents.
Similar Questions
A recently depolarized area of a cell membrane cannot generate an action potential because of theMultiple Choicehigh concentration of sodium ions in the extracellular fluid.the high concentration of potassium ions in the cytoplasm.absolute refractory period.presence of receptor sites on the membrane.
When traveling along an axon, the cell membrane immediately ahead of an action potential depolarizes because of _________blank.Multiple Choicemembrane receptorsdiffusion of sodium currentthe sodium/potassium pumpdecreased membrane permeabilitypotassium efflux
An action potential arriving at the presynaptic terminal causesMultiple Choicevoltage-gated sodium ion channels to open, and sodium ions to diffuse out of the cell.voltage-gated calcium ion channels to open, and calcium ions to diffuse into the cell.voltage-gated sodium ion channels to open, and sodium ions to diffuse into the cell.ligand-gated sodium channels to open, and sodium ions to diffuse out of the cell.acetylcholine to diffuse into the cell.
During the depolarisation stage of an action potentialThe membrane potential returns to resting conditionsSodium (Na+) enters the cell down it's concentration gradientVoltage gated K+ channels are openPotassium (K+) enters the cell against its concentration gradient
The inside of the cell membrane becomes negative at the time of an action potential.
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