Zoology - Neural Control and Coordination Question with Solution | TestHub

During resting state of neuron, axonal membrane is

A. More permeable to${\mathrm{K}}^{+}$.
B. Nearly Impermeable to${\mathrm{N}\mathrm{a}}^{+}$.
C. Impermeable to negatively charged proteins present in the axoplasm.

- The high concentration of${\mathrm{K}}^{+}$and negatively charged proteins and low concentration of${\mathrm{N}\mathrm{a}}^{+}$in axoplasm.

- In contrast, the fluid outside the axon contains a low concentration of${\mathrm{K}}^{+}$, a high concentration of${\mathrm{N}\mathrm{a}}^{+}$and thus form a concentration gradient.

- These ionic gradients across the resting membrane are maintained by the Na–K pump which actively transports$3{\mathrm{N}\mathrm{a}}^{+}$outwards for$2{\mathrm{K}}^{+}$into the cell.

- The outer surface of the axonal membrane is positively charged. The inner surface of axonal membrane is negatively charged.

- The axonal membrane is polarised and the potential difference is known as resting potential.