During a relative refractory period of an action potential   A. Another action potential can be fired, it just takes a greater stimulus for the membrane potential to reach threshold   B. Na+ channels are either already open or are inactivated therefore the membrane absolutely can not produce another action potential, no matter how intense the stimulus   C. Ca++ flows out of the cell, causing hyperpolarization and a need for a greater stimulus to generate the action potential   D. The presynaptic neuron "tells" the postsynaptic neuron about the "relative" strength of signal   E. None of the above are correct

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