Question

The conduction of an impulse depends on:

a. a high concentration of Na+ inside and a low concentration of K+ outside
b. a high concentration of K+ outside and a low concentration of Na+ inside
c. a change in the membrane's permeability to Na+
d. the membrane being impermeable to anions

Answer 1

Option (a).

Step-by-step explanation:

Nerve impulse can be defined as electric signals, which is passed along the nerve dendrites to generate action potential (movement of ions inside and out of the cell).

At resting phase, plasma membrane of nerve cell maintains resting potential with the help of sodium-potassium pump. Upon stimulation, sodium ion channels on membrane get opened, which allows sodium ions to enter the cell and increased concentration of sodium ions inside the cell.

This movement of sodium ions causes depolarization of membrane and generates an action potential.

Thus, the correct answer is option (a).