An action potential involves Na moving inside the cell and K moving outside the cell.
The inward influx of sodium (Na) ions induces depolarization, or when the potential of the cell is greater than its resting potential, by increasing the concentration of positively charged cations in the cell. At the peak of the action potential, sodium (Na) channels shut as potassium (K) continues to move outside the cell.
When the membrane potential at a particular cell site rapidly increases and decreases, this is known as an action potential (AP). Following this depolarization, nearby areas also experience depolarization. Excitable cells, which include neurons, muscle cells, endocrine cells, and certain plant cells, are a class of animal cells that exhibit action potentials.
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