Which one of the following steps occurs during the absolute refractory period Sodium channels open which causes potassium

Question

Which one of the following steps occurs during the absolute refractory period Sodium channels open which causes potassium channels to open Potassium channels open releasing potassium ions from the neuron sodium channels close Sodium channels open releasing sodium ions into the neuron which causes potassium channels to close The neuron cannot generate an action potential A nerve impulse fails to reach threshold

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