Cells 7. In order to maintain homeostasis, human cells must have a higher concentration of sodium ions outside the cell than inside the cell. In addition, the concentration of potassium ions must be higher inside the cell than outside the cell. Which of the following forms of cellular transportation helps human cells maintain a relatively constant sodium and potassium concentration? diffusion endocytosis osmosis a cell membrane pump
D the sodium and potassium pump is responsible for transportation.