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Hyperpolarization (the membrane potential becomes more negative)
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∙ 13y ago
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What is the phase in the action potential that immediately follows repolarisation?
After the falling phase or repolarization the membrane potential goes below its normal resting potential.This phase is often called undershoot, or phase of hyperpolarization.
Does action potential involve the influx of negative ions to depolarize the membrane?
No. The negative ions stay within the cell (neuron).An action potential begins (rising phase) with an influx of sodium, a positive ion or cation. The rising phase ends (falling phase) with an efflux of positive ions (potassium). The membrane potential is stabilized again with the action of the ATP dependent sodium-potassium pump.
What is an afterhyperpolarization?
An afterhyperpolarization is the hyperpolarizing phase of a neuron's action potential.
What characterizes depolarization the first phase of the action potential?
The membrane potential changes from a negative value to a positive value
What type of membrane transport causes the depolarization phase of the action potential in neurons?
Diffusion
What is the phase in the action potential that immediately follows repolarisation?
After the falling phase or repolarization the membrane potential goes below its normal resting potential.This phase is often called undershoot, or phase of hyperpolarization.
Does action potential involve the influx of negative ions to depolarize the membrane?
No. The negative ions stay within the cell (neuron).An action potential begins (rising phase) with an influx of sodium, a positive ion or cation. The rising phase ends (falling phase) with an efflux of positive ions (potassium). The membrane potential is stabilized again with the action of the ATP dependent sodium-potassium pump.
What phase of cardiac muscle action potential caused by sodium ions entering cell?
The first phase of a cardiac action potential (or any action potential) involves influx of sodium ions. This phase may be called:The rising phaseThe depolarization phasePhase 0
What is an afterhyperpolarization?
An afterhyperpolarization is the hyperpolarizing phase of a neuron's action potential.
What ion is the rising phase of the action potential?
Sodium ions are responsible for the rising phase of the action potential. This occurs when sodium channels open and sodium ions flow into the cell, causing depolarization.
List the events that occur in an action potential?
In simplest terms, the five stages of action potential are... A. Action Potential B. Depolarization C. Recovery Phase D. Refractory Period E. Hyper-polarization
What characterizes depolarization the first phase of the action potential?
The membrane potential changes from a negative value to a positive value
What type of membrane transport causes the depolarization phase of the action potential in neurons?
Diffusion
What is the name of the 1rst phase of the action potential that is caused by the inward movement of sodium?
repolarization
What are the Stages of nerve impulses?
The action potential has 5 main phases:1) stimulation/rising phase - depolarization caused by influx of sodium ions at the axon hillock; potential increases from a resting potential of -70 mV2) peak phase - depolarization and membrane potential reaches a peak, with sodium channels open maximally, at about +40 mV3) falling phase - potassium channels open in response, causing a subsequent reduction in membrane potential, and the neuron begins to repolarize4) hyperpolarization/undershoot phase - more potassium channels stay open after sodium channels close, causing a hyperpolarization of the neuronal membrane, bringing the potential down below its initial resting potential (below -70 mV)5) refractory phase - potassium channels begin to close, allowing the membrane potential to revert back to the resting potential of -70 mV; during this phase, the probability of the nerve being able to refire is extremely low, thus allowing for a delay between action potentials
Why is an action potential is self-regenerating?
The Na+ diffusing into the axon during the first phase of the action potential creates a depolarizing current that brings the next segment, or node, of the axon to threshold.
Why is an action potential self-regenerating?
The Na+ diffusing into the axon during the first phase of the action potential creates a depolarizing current that brings the next segment, or node, of the axon to threshold.
