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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.
Wiki User
∙ 11y ago
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∙ 14y agoAction potential is initiated in the axon hillock region.
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∙ 14y agoAn action potential occurs across the cell wall when a nerve is stimulated by the transmission of a nerve impulse.
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∙ 11y agoThe action potential is generated at the axon hillock, a slight swelling in the axon just after the cell body.
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∙ 11y agoAt axon hillock, or, more accurately, at the initial segment, just after the axon hillock.
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∙ 12y agoaxon hillock
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Why do not action potentials occur during the repolarization phase?
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.
Does action potentials occur at nodes?
yes, the action potential occurs at the nodes of Ranvier -- there are Na (sodium channels) there that are depolarized/opened to maintain the action potential.
How does an action potential differ from a graded potential?
Action potentials also known as spikes, differ from graded potentials in that they do not diminish in strength as they travel through the neuron.
Where do most action potentials originate?
initial segment
Can action potentials be summated?
no but generator potential can be summated
Why do not action potentials occur during the repolarization phase?
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.
Does action potentials occur at nodes?
yes, the action potential occurs at the nodes of Ranvier -- there are Na (sodium channels) there that are depolarized/opened to maintain the action potential.
Do action potentials become weaker with distance?
action potentials are non-decremental and do not get weaker with distance.
What do intercalated discs transfer from cell to cell?
action potentials, ionic currents, the force of contraction and ionic currents and action potentials only
How does an action potential differ from a graded potential?
Action potentials also known as spikes, differ from graded potentials in that they do not diminish in strength as they travel through the neuron.
What is the result of parasympathetic stimulation of the SA node?
Action potentials will occur less often due to an increase in the membranes permeability to K+
Communication in the nervous system depends on?
action potentials
Does nervous tissue generate action potentials?
Yes.
Where do most action potentials originate?
initial segment
A nerve impulse consists of a wave of?
Action Potentials
Can action potentials be summated?
no but generator potential can be summated
What part of the ear converts vibrations to action potentials?
The inner ear contains the receptors for sound which convert fluid motion into action potentials that are sent to the brain to enable sound perception. The airborne sound waves must be transferred into the inner ear for hearing to occur.
