What happens when an incoming impulse increases the positive charge inside a neuron to a certain level?

Name: What happens when an incoming impulse increases the positive charge inside a neuron to a certain level?
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All of these events occur when an incoming impulse increases the positive charge inside a neuron to a certain level: the neuron becomes depolarized, it fires, and sodium channels at the top of the axon open. This process is part of the action potential mechanism in neurons.

What Happens When an Incoming Impulse Increases the Positive Charge