Question

What moves across axons?

Answer 1

The neuron maintains a resting membrane potential. ... Because potassium is in high concentration inside the neuron, there is a concentration gradient attempting to force potassium out of the cell. Similar forces will attempt to move sodium ions into the neuron.   so the answer is A ions

Answer 2

I BELIEVE the answer is neurons.

See, the electrical impulse moving down a  axon is a nerve impulse that help your body communicate to itself. 

From there, I am not sure.

D, I suppose..?