Neurons do not normally fire more than 1,000 times per second because
A) the absolute refractory period is typically about 1 millisecond.
B) the relative refractory period is typically about 1 millisecond.
C) the total refractory period is typically about 1 millisecond.
D) the sodium-potassium pump cannot repolarize the cell in less than 1 millisecond.
E) higher rates over excite the neuron.
Answer: A
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