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 out of the cell by active transport
B. Na+ moves in and out of the cell by passive diffusion
C. Na+ moves in and out of the cell by active transport
D. Na+ moves into the cell by active transport and out of the cell by facilitated diffusion
E. Na+ moves into the cell by facilitated diffusion and can not move out of the cell


A. Na+ moves into the cell by facilitated diffusion and out of the cell by active transport

Biology & Microbiology

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