In an action potential, the current that flows down the axon of a neuron is generated by the movement of across the membrane.

The correct answer for: In an action potential, the current that flows down the axon of a neuron is generated by the movement of across the membrane. Is: Ion

Explanation:

All right, first of all, we need to understand something the neuron communication process to another neuron is called synapsis. This synapsis requires a certain phenomenon called neuron action potential in which the neuron accumulate energy thanks to the sodium ions until it triggers creating an impulse called "spike" that is an electrochemical signal produced by the accumulation of Ions in the body of the neuron and goes through the axon until reaching the dendrites and connecting to another neuron and releasing an electrochemical pulse produced in the same way in all the neurons to create a reaction. That is why Ion is our answer because they are the element that moves from the body to the membrane to the axon and then the dendrites in an electrochemical impulse.