Which of the following is most clearly characterized by a temporary inflow of positively charged sodium ions through an axon membrane?

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An action potential is characterized by a temporary inflow of positively charged sodium ions through an axon membrane, which depolarizes the membrane and triggers a rapid electrical signal down the length of the axon. Reuptake is the reabsorption of neurotransmitters by a presynaptic neuron, a refractory period is the time period during which a neuron is unable to fire new action potentials, and the resting potential is the electrical charge difference between the inside and outside of a neuron's membrane when it is not actively transmitting a signal.

Which of the Following Is Most Clearly Characterized by a Temporary