Answer:
B. high potassium ion concentration on the inside of the cell membrane and a high sodium ion concentration on the outside of the cell membrane.
Explanation:
Every response of a human to any situation occurs due to the working of network of neurons which take the stimulus from environment move it to brain and then produce a specific response.
The neuron normally stays in a polarized state when there is no external stimuli and it do not has to produce any response. In this case the membrane potential is –70 mV and there is a high potassium ion concentration on the inside of the cell membrane and a high sodium ion concentration on the outside of the cell membrane (please see figure). But when a stimulus of specific threshold greater than the resting potential is acheived, the situation reverses. Na+ channels open in the membranes and Na+ quickly start moving inside the membrane while K+ starts coming outside of the membrane This is called Depolarization which is later followed by subsequent events of Repolarization and Hyperpolarization .
Therefore, Option B is correct option.
