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Which of the following explains the unidirectional propagation of action potentials?a. The voltage dependence of the sodium channelsb. The voltage dependence of the potassium channelsc. The presence of a refractory period at a location where an action potential has just passedd. Sufficient "leakiness" of the axons, such that backward propagation of action potentials is preventede. The polarized orientation of microtubules within the axon

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