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This Concept Map, created with IHMC CmapTools, has information related to: AP Phases-Joanna KM, Hyperpolarization at ~-90mV, stimulus changes Resting Potential, stimulus if strong enough, Resting Potential at ~ -70 mV, ACTION POTENTIAL third phase Depolarization, Resting Potential goes to Threshold, Threshold cell becomes more permeable to NA+, Repolarization from ~+40 mV, stimulus if many, K+ voltage-sensitive channels causes K+flow outside the cell, ACTION POTENTIAL second phase Threshold, Repolarization opening of K+ voltage-sensitive channels, Threshold at ~-55mV, Depolarization causes NA+ flow inside the cell, Repolarization close Na+ voltage-sensitive channels, Hyperpolarization decrease in permeability to K+, Na+ voltage-sensitive channels will cause return to membrame resting potential, more permeable to NA+ causes Na+ flow inside the cell, Depolarization goes to ~+40 mV, ACTION POTENTIAL fourth phase Repolarization