They both stay open.
If sodium channels were to remain closed, there wouldn't be any repolarization. The Potassium concentration gradient would keep pumping Potassium ions out of the cell and the Potassium electrical gradient would drive Potassium ions into the cell, thus maintaining the equilibrium potential of -90 mV.
No repolarization would occur if the sodium channels are closed.
The above is not correct.
During the depolarization phase, BOTH VOLTAGE-GATED SODIUM & POTASSIUM channels open.
Once the cell reaches close to sodium's equilibrium potential, the VOLTAGE-GATED sodium channel closes.
The VOLTAGE-GATED potassium channel opens around this time
(The voltage gated potassium channel is very slow to open; it fully opens around the same time the voltage gated sodium channel closes) causing repolarization.
The cell experiences hyperpolarization because the voltage gated potassium is also slow to close.
Once fully closed, the cell depolarizes back to resting potential.
Also, the picture is a picture of the AP in cardiac muscle which differ from skeletal muscle.
The plateau is due to voltage-gated calcium channel that opens during the AP.
During an action potential, repolarization occurs as a result of the opening of voltage-gated potassium channels. These channels allow potassium ions to flow out of the cell, leading to a decrease in membrane potential back towards the resting state. Repolarization is essential for resetting the neuron and allowing it to fire another action potential.
The period of repolarization of a neuron corresponds to the time when potassium ions move out of the neuron, allowing the cell to return to its resting potential. This phase follows the peak of the action potential when sodium channels close and potassium channels open, leading to membrane potential restoration. Repolarization is essential for the neuron to be able to generate subsequent action potentials.
The stage that immediately follows depolarization in an action potential is repolarization. During this stage, potassium channels open and potassium ions move out of the cell, leading to a restoration of the cell's negative charge.
It has to do with what types of channels are open during this phase. In the repolarization phase the number of potassium channels are increased and the number of sodium channels are decreased. This allows for action potentials to not occur. Otherwise, the action potentials would add up and produce tetany.
The potassium (K+) channel gate opens immediately after an action potential has peaked. This allows potassium ions to flow out of the cell, resulting in repolarization of the membrane potential back to its resting state.
During an action potential, repolarization occurs as a result of the opening of voltage-gated potassium channels. These channels allow potassium ions to flow out of the cell, leading to a decrease in membrane potential back towards the resting state. Repolarization is essential for resetting the neuron and allowing it to fire another action potential.
The period of repolarization of a neuron corresponds to the time when potassium ions move out of the neuron, allowing the cell to return to its resting potential. This phase follows the peak of the action potential when sodium channels close and potassium channels open, leading to membrane potential restoration. Repolarization is essential for the neuron to be able to generate subsequent action potentials.
The stage that immediately follows depolarization in an action potential is repolarization. During this stage, potassium channels open and potassium ions move out of the cell, leading to a restoration of the cell's negative charge.
repolarization by allowing potassium ions to flow out of the cell, restoring the negative resting membrane potential. This helps terminate the action potential and allows the cell to prepare for the next stimulus. The delayed opening of potassium channels helps ensure proper signaling and coordination of cellular functions.
It has to do with what types of channels are open during this phase. In the repolarization phase the number of potassium channels are increased and the number of sodium channels are decreased. This allows for action potentials to not occur. Otherwise, the action potentials would add up and produce tetany.
During an action potential, the major events include depolarization (sodium channels open, sodium ions enter the cell), repolarization (potassium channels open, potassium ions leave the cell), and hyperpolarization (potassium channels close slowly leading to an overshoot of the resting membrane potential). Sodium influx causes depolarization, while potassium efflux causes repolarization and hyperpolarization.
The potassium (K+) channel gate opens immediately after an action potential has peaked. This allows potassium ions to flow out of the cell, resulting in repolarization of the membrane potential back to its resting state.
Membrane potential - a nerve cell set and ready to fire;"The wave of reverse polarity" i.e. sodium versus potassium trans-cell-membrane ion passaging - a nerve cell firing; andRecharge period - the regeneration time.
Opening of potassium channels allows potassium ions to move out of the neuron, leading to hyperpolarization by increasing the negative charge inside the neuron. This action increases the charge difference across the membrane, known as the resting membrane potential, making the neuron less likely to fire an action potential.
The stage that immediately follows depolarization in an action potential is repolarization. During repolarization, potassium ions move out of the cell, causing the membrane potential to return to its resting state.
Repolarization is the phase in which the membrane potential returns to its resting state after depolarization. This is achieved by the outflow of potassium ions from the cell, restoring the negative charge within the cell relative to the outside. Repolarization is crucial for resetting the cell's electrical potential and preparing it for the next action potential.
During repolarization, potassium channels open and potassium ions exit the cell, causing the inside of the cell to become more negative. This process restores the cell's resting membrane potential. It follows the depolarization phase, where sodium channels open and sodium enters the cell, causing the inside of the cell to become more positive.