The cell membrane immediately adjacent to an action potential depolarizes because ofMultiple ChoiceMembrane receptorsLocal currentsSodium ionsMembrane permeability
Question
The cell membrane immediately adjacent to an action potential depolarizes because ofMultiple ChoiceMembrane receptorsLocal currentsSodium ionsMembrane permeability
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 these areas of the cell, causing them to also depolarize.
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This process continues along the length of the neuron, creating a wave of depolarization. This wave is the action potential moving down the neuron.
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The movement of ions that causes this wave of depolarization is due to local currents. These are movements of positive charge due to the differences in voltage across the membrane.
So, 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 ChoiceAbsolute refractory periodPresence of receptor sites on the membraneHigh concentration of sodium ions in the extracellular fluidThe high concentration of potassium ions in the cytoplasm
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
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
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.
The inside of the cell membrane becomes negative at the time of an action potential.
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