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How does depolarization of neuronal membrane start

How does depolarization of neuronal membrane start?

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Primary cause of neuronal depolarization is binding of neurotransmitters released in synapse (by axon of neuron that Resting potential is membrane voltage when the cell is not excited, about –70 mV.

Excitation threshold is voltage level, about –50 mV that the initial depolarization should reach for the action potential to be achieved.

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