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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.
How fast does an action potential travel down a myelinated nerve?
An action potential is not passively propagated down the axon. There have to be ion channels along the axon or else the action potential will gradually decay. So the the rate of that the action potential 'travels' is dependent on the passive property called the length constant of the axon (factor in capacitance, axon diameter) plus the density of ion channels.
Where do action potentials occur?
The spike initiation zone, also called axon hillock, is the point where the cell body of the neuron meets the axon and is the point where most action potentials are initiated.
Which part of the neuron can propagate an action potential?
axon
Where in a neuron can an action potential be generated?
axon hillock
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.
During depolarization of action potential the outer part of axon becomes?
Negative
Are action potential and local potential reversible?
Under normal circumstances action potential will proceed unilaterally. An action potential cannot proceed down an axon and depolarize in the reverse direction on the same axon. It must carry information on one axon in one direction and then on another axon in a separate direction. In a lab you can depolarize neurons in the middle of an axon and it will depolarize bilaterally.
Which ion enters an axon to start a nerve impulse?
Sodium is the first ion to enter the axon, initiating the action potential.
Why do neuron sodium ions move from outside to inside the ason when an action potential travls along the axon?
Sodium is a positive ion. As it enters the cell the sodium influx raises the membrane potential (voltage) in that area. By doing this at many different stages along the axon one after the other, this positive current flows down the axon as an action potential, transferring nerve impulses from one neurone to the other.
How fast does an action potential travel down a myelinated nerve?
An action potential is not passively propagated down the axon. There have to be ion channels along the axon or else the action potential will gradually decay. So the the rate of that the action potential 'travels' is dependent on the passive property called the length constant of the axon (factor in capacitance, axon diameter) plus the density of ion channels.
Which part of the neuron can propagate an action potential?
axon
Where in a neuron can an action potential be generated?
axon hillock
Where do action potentials occur?
The spike initiation zone, also called axon hillock, is the point where the cell body of the neuron meets the axon and is the point where most action potentials are initiated.
Where does an action potential start?
Action potentials are generated on a part of the neuron called the 'axon hillock' - the proximal most portion of the axon.
What part of the neuron can conduct an action potential?
Axon, telondendria
