Question

At resting stage nerve cell has

• A. Low $K^{+}$ outside and high N$a^{+}$ inside
• B. High $K^{+}$ inside and high N$a^{+}$ outside
• C. High $K^{+}$ inside and low N$a^{+}$ outside
• D. High $K^{+}$ outside and low N$a^{+}$ inside

Answer 1

The correct option is B High $K^{+}$ inside and high N$a^{+}$ outside

B. High K+ inside and high Na+ outside

Reason: When the neuronal membrane is at rest, a high accumulation of sodium ion outside the membrane and a high concentration of potassium ion inside the membrane is observed. But the concentration of Na+ remains higher than K+. Thus the resting potential becomes negative due to the accumulation of more sodium outside the cell than potassium inside the cell and the membrane remains polarised. So the correct option is B.