Answer to Question #56069 in Human Anatomy and Physiology for SU
The cell membrane depolarizes
Potassium voltage-gated channels open
Sodium voltage-gated channels open
The potential difference reverses (the inside of the cell actually gets slightly positive)
All of the above occur during the depolarization phase of an action potential
This process leads to potassium movement out of the cell. And it happens during repolarization. All the rest processes do happen during depolarization.
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