单项选择题
The cell membrane can differentially distribute ions such as potassium and sodium between the inside and outside of a cell. Given that there are more negatively charged non-diffusible proteins inside cells than in interstitial fluids, which of the following statements is true?
A、The resting membrane potential is sensitive to extracellular Na+ concentration
B、The concentrations of diffusible ions on the inside and the outside of the cell membrane are equa
C、The equal concentrations of intra- and extra-cellular Na+ and K+ gives rise to an electrical potential across the cell membrane
D、At equilibrium, there is no electrical gradient across the cell membrane
E、The Na+, K+-ATPase generates a negative electrical potential inside the cell
