Your brain cells, or neurons are constantly sending electrical signals to each other. In order for this to occur, they need to move sodium (Na+) and
potassium (K+) ions against their concentration gradient. So even if there is
more Na+ outside of the cell and less inside, the cell wants to keep
pumping the Na+ out of the cell against its concentration gradient. What
type of transport will it need to do? *

Facilitated diffusion
Simple diffusion
Active transport-protein pumps
Exocytosis