What is the threshold for an action potential?
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James Rodriguez
Works at Amazon, Lives in Seattle, WA
As a neuroscientist with a focus on cellular and molecular neuroscience, I can tell you that the action potential is a critical mechanism for the propagation of signals in neurons. It's initiated when a stimulus alters the membrane potential of a cell to a level that triggers a rapid, self-propagating depolarization.
The threshold for an action potential is typically reached when the membrane potential of a neuron reaches a level slightly more negative than the resting potential, which is around -55 mV. This value can vary slightly depending on the neuron type and the species. Once this threshold is crossed, voltage-gated sodium channels open, leading to a rapid influx of sodium ions, which causes the membrane potential to become positive and initiates the action potential.
Studied at Harvard University, Lives in Cambridge, MA
The action potential is an explosion of electrical activity that is created by a depolarizing current. This means that some event (a stimulus) causes the resting potential to move toward 0 mV. When the depolarization reaches about -55 mV a neuron will fire an action potential. This is the threshold.
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Oliver Wilson
QuesHub.com delivers expert answers and knowledge to you.
The action potential is an explosion of electrical activity that is created by a depolarizing current. This means that some event (a stimulus) causes the resting potential to move toward 0 mV. When the depolarization reaches about -55 mV a neuron will fire an action potential. This is the threshold.
