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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
(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 formed by lipids in the membrane.
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
(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 formed by lipids in the membrane.
Correct option (B) Na+ and K+ pumps in the membrane.
Explanation:
Energy derived pumps are present in plasma membrane.