Concentration of `Na^(+)` ions outside a nerve cell is `~100` times more than inside. The concentration of `K^(+)` ions is more inside the cells. The levels of `Na^(+)` ions and `K^(+)` ions are maintained by

Options

A. free diffusion of `Na^(+)` ions and pumping of `K^(+)` ions across the membrane.
B. `Na^(+) " and " K^(+)` pumps in the membrane.
C. free diffusion of `K^(+)` ions and pumping of `Na^(+)` ions across the membrane
D. water channels fomed by lipids in the membrane.

Answer

B

Explanation

Energy derived pumps are present in plasma membrane.