Question

Potential difference across resting membrane in neurons is negatively charged. This is due to differential distribution of the following ions:

• A. $N{a}^{+}$ and $K^{+}$ ions
• B. $M{g}^{2+}$and $C{l}^{–}$ ions
• C. $C{a}^{2+}$ and $M{g}^{2+}$ ions
• D. $C{a}^{2+}$ and $C{l}^{–}$ ions

Answer 1

The correct option is A $N{a}^{+}$ and $K^{+}$ ions

Potential difference across resting membrane in neurons is maintained by sodium and potassium ions. The ion channels on the neural membrane control the movement of $N{a}^{+}$ and $K^{+}$ ions on both inner and outer side of nerve cell.

Calcium and magnesium ions are not related with nerve excitation rather are involved in other biological functions. $C{a}^{2+}$ ions are related to muscle metabolism where as $M{g}^{2+}$ ions act as a cofactor. $C{l}^{–}$ ions are one of the most important electrolytes in blood.