KVPY SX SB Exam 05-Nov-2017 Question Paper

Question : 67 of 120

Marks: +1, -0

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

free diffusion of Na $^{+}$ ions and pumping of K $^{+}$ ions across the membrane.
Na $^{+}$ and K $^{+}$ pumps in the membrane.
free diffusion of K $^{+}$ ions and pumping of Na $^{+}$ ions across the membrane.
water channels formed by lipids in the membrane.

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