Question

Which of the following statements about resting potential is true? A resting membrane allows much more sodium than potassium to diffuse across. The concentration of sodium is much higher inside the cell than outside. The resting potential exists because of differences in glucose concentration inside and outside the cell. The sodium-potassium pump contributes to the resting membrane potential.

Answer 1

Answer:

The sodium-potassium pump contributes to the resting membrane potential.

Explanation:

This is the stage in which the neuron is not depolarize. 3Na+ are pumped outside  through  the sodium  channels, while  K+ channels are open for2 K+ to enter the cells.After some time the Na+ channels closed up. However some K+ channels still leaks , so that K+ still escape out of the cells to the external environment ,which contains more of Na+. Therefore at this stage there are more Na+ outside the neuron compare to the inside the neuron. Therefore the inside of the neuron is negative , because more K+ are leaving the cells, leaving negatively charged anions inside, and the outside is positive  due to more Na+ are outside, and because the K+ leaking outwards.

The regulation of the Na+ and K+ ions movements is regulated by sodium potassium pumps along the membrane of the neuron. if the potential at this stage is measured, it has a value of -70mv, and it is called membrane potential.