A resting nerve fiber is polarized because: a) the concentration of Na+ and K+ ions is higher on the inside of the cell membrane
b) Na+ and K+ ions is higher outside the cell membrane c) Na+ is higher on the inside and K+ is higher on the outside d) Na+ is higher on the outside and K+ is higher on the inside.
Na+ is higher on the outside and K+ is higher on the inside. (Ans. D)
Explanation:
Polarization is established by maintain the concentrations of Na+ is higher on the outside and K+ is higher on the inside. An amount of K+ and Na+ is always get out across the membrane with the help of leakage channels, but Na+/K+ pump which is present on the membrane helping in to restore the ions to the suitable side.
The resting nerve fiber (polarized nerve) is showing difference in permeability of the both ions. It is more permeable in nature to K+ ion than Na+ ion.
