39) The absolute refractory period of an action potentialA) only prevents summation of action potentials. B) ensures one-way travel down an axon, allows a neuron to ignore a second signal sent that closely follows the first, and prevents summation of action potentials. C) only ensures one-way travel down an axon. D) only allows a neuron to ignore a second signal sent that closely follows the first. E) ensures one-way travel down an axon and allows a neuron to ignore a second signal sent that closely follows the first.

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