Question
At the membrane potential when voltage gated Na+ channels open, an action potential is sure to fire. This membrane potential is called _____.
Answer: Option B
:
B
Threshold potential can be defined as the state of depolarisation at which an action potential is sure to fire. When a neuronal membrane depolarizes to about -55mV, the voltage gated (Na+) channels open. Once these channels open there is no preventing an action potential because these channels, regulated by voltage open causing a positive cascade i.e. opening of these channels depolarises the membrane further by allowing (Na+) ions inside the cell and more depolarisation opens more voltage gated sodium channels.
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:
B
Threshold potential can be defined as the state of depolarisation at which an action potential is sure to fire. When a neuronal membrane depolarizes to about -55mV, the voltage gated (Na+) channels open. Once these channels open there is no preventing an action potential because these channels, regulated by voltage open causing a positive cascade i.e. opening of these channels depolarises the membrane further by allowing (Na+) ions inside the cell and more depolarisation opens more voltage gated sodium channels.
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