What Causes The Rapid Change In The Resting Membrane Potential That Initiates An Action Potential?

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What Causes The Rapid Change In The Resting Membrane Potential That Initiates An Action Potential?

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- when a resting cell is stimulated through voltage-regulated channels, the cell membranes become more permeable to Na+. There is a net movement of Na+ into the cell & membrane potential decreases. - Na+ gates open & Na+ rushes into the cell, changing the membrane potential from negative to positive (depolarization) - when it becomes sufficiently positive, the Na+ channels close & the K+ channels open - Now K+ leaves the cell, & the membrane potential becomes more negative (repolarization) - Hyperpolarization (undershoot) - the return of the membrane potential to the resting level is completed by the Na+/K+ pump, which exchanges the inside Na+ for the outside K+
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