Question

A polarized neuron is the one that is

• A. conducting impulses
• B. at resting potential
• C. having action potential
• D. none of the above

Answer 1

The correct option is B at resting potential

At resting state, a neuron is not conducting any impulse, the axonal membrane is comparatively more permeable to potassium ions $\left(K^{+}\right)$ and nearly impermeable to sodium ions $\left(N{a}^{+}\right)$ and to negatively charged proteins present in the axoplasm. As a result, the outer surface of the axonal membrane possesses a positive charge while its inner surface becomes negatively charged and this neuron is called a polarised neuron. The electrical potential difference across the resting plasma membrane is called as the resting potential.