Question 12 of 20

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 When a stimulus excites a nerve, the following events occur in this sequence:

slow depolarization whereby the electrical potential in the nerve becomes slightly less negative

when this electrical potential reaches a critical level, there is then a rapid phase of depolarization called threshold potential or firing threshold

this depolarization brings about a reversal of the electrical potential across the nerve membrane - the interior of the nerve is now positive in relation to the negative exterior