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state in which a neuron is prepared to activate and communicate it's message if it receives sufficient stimulation; where the inside of the neuron is -70mV more negative than the outside
the level or point at which the action potential will occur; about -40mV inside the neuron
when the neural membranes of the axon become open to Na+ ions, making the inside charge positive
Na+ - K+ pump
restores the neuron to resting potential; placing Na+ ions outside and K+ ions back inside
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