Question

During the propagation of a nerve impulse, the action potential results from the movement of

(a) K+ ions from extracellular fluid to intracellular fluid

(b) Na+ ions from intracellular fluid to extracellular fluid

(c) K+ ions from intracellular fluid to extracellular fluid

(d) Na+ ions from extracellular fluid to intracellular fluid

Answer 1

The correct option is (a) K+ ions from extracellular fluid to intracellular fluid.

Explanation:

During the never impulse when a stimulus of adequate strength is applied to a polarised membrane the permeability of the membrane to Na+ is increased at the point of stimulation. As a result the sodium ion channels permits the fluid from extracellular fluid.