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Figure 1. Graph of computed action potentials using the FitzHugh-Nagumo model, the minimal model for an excitable cell; it consists of a single inward (excitatory, Na) current and a single outward (recovery or repolarizing K) current. Shown here are two computed action potentials for potassium conductances (gK) of 1.13 and 0.75 arbitrary time units. Reducing gK prolongs the time required to repolarize the action potential, thereby increasing the action potential duration and the refractory period. Here, the action potential is prolonged from 0.70 to 0.91 arbitrary time units.




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