Na+ ion concentrations are higher outside the cell than inside the cell. What type of transport system is required to move Na+ ions in and out of the cell?
A. Na+ moves into the cell by facilitated diffusion and can not move out of the cell
B. Na+ moves in and out of the cell by active transport
C. Na+ moves into the cell by facilitated diffusion and out of the cell by active transport
D. Na+ moves in and out of the cell by passive diffusion
E. Na+ moves into the cell by active transport and out of the cell by facilitated diffusion
Answer: C
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