91影视

The semi-permeability of the cell鈥檚 plasma membrane accounts for electrical charge differences across its internal region and extracellular environment. The resting membrane potential is the value of electric charge difference at the cell membrane surface when a cell is at the state of rest.

Depolarization is the phase that leads to the generation of an action potential at any excitable cell membrane (such as a neuron鈥檚 cell membrane). This phase occurs when sodium ions profusely enter the cell鈥檚 interior region.

Thus, depolarization involves the flow of sodium ions towards the internal region.

Therefore, the given statement is false.

Generally, the potassium ions are higher towards the cell鈥檚 interior than the exterior side; due to this, positively charged potassium is transported out of the cell until equilibrium is established.

As the flow of potassium is outwards, the cell鈥檚 interior becomes negative, and the value of E_K (potassium鈥檚 equilibrium potential) is negative.

Thus, an alteration in the membrane potential would either make E_K more negative or less negative.

Therefore, the given statement is false.

An incoming signal triggers the opening of sodium ion channels at the neuronal cell membrane and accounts for the rapid flow of sodium towards the cell鈥檚 inside. The build-up of positive ions in the internal region makes the membrane positive and accounts for the membrane鈥檚 depolarization.

Thus, sodium accumulation inside the neuronal cell makes the membrane potential positive during the neuron鈥檚 depolarization phase.

Therefore, the given statement is true.

In any excitable cell, including the neurons, the internal region of the cell comprises a higher amount of negative charge at rest condition. In contrast, at the depolarized condition, the cell has a higher positive charge towards the interior.

Thus, the charge difference mentioned in this statement is present at the resting phase of the membrane.

Therefore, the given statement is false.