Question

What initially causes a nerve impulse

Answer 1

Answer is B) The movement of chemicals into the dendrites of the neuron causes a nerve impulse.

Answer 2

Nerve impulses are caused by Potassium (K+) and Sodium (Na+) ions that are located inside and outside of the cell. The structure of the cell membrane is permeable to Potassium but are highly impermeable to Sodium ions. These impulses are transmitted from one nerve cell to the other in very fast series.