1.

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.  

Answer»

Correct option  (B) Na+ and K+ pumps in the membrane. 

Explanation:

Energy derived pumps are present in plasma membrane.



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