Question

If the concentration of sodium is greater outside a cell than inside the cell, which process could move sodium out of the cell?

Answer 1

Diffusion occurs because of the movement of molecules from the region of higher concentration to the region of lower concentration. This movement of molecules occurs due to a thermal motion. Diffusion normally occurs between two compartments having difference in concentration. In case of fluid it moves from the region of higher concentration to the region of concentration until a balance is reached. The process of diffusion is very important for the humans as well. The oxygen that humans breathe in gets diffused with the blood. 

Answer 2

Answer;

- Active transport

The process that could move sodium out of the cell is the active transport.

Explanation;

-Active transport involves the movement of particles or molecules across a membrane against a concentration gradient (from a region of their lower concentration to a region of their higher concentration).

-The mechanism of active transport requires the use of the cell's energy, usually in the form of adenosine triphosphate (ATP).