The following questions refer to comparative concentrations, permeabilities, and potentials under various circumstances. Indicate the relationship between the two items listed in each situation by following answer code.
-A. permeability of a resting nerve cell membrane to K?
B. permeability of a resting nerve cell membrane to A?
A)A is greater than B
B)B is greater than A
C)A and B are equal

Question

Quizplus · Accepted Answer

The resting membrane potential of a nerve cell is due to the difference in permeability of the membrane to K+ and Na+ ions. K+ ions are more permeable than Na+ ions, so they tend to leak out of the cell, leaving behind a negative charge inside the cell. This negative charge attracts Na+ ions, which then enter the cell. The difference in permeability between K+ and Na+ ions creates a concentration gradient and an electrical gradient, which together produce the resting membrane potential.

The Following Questions Refer to Comparative Concentrations, Permeabilities, and Potentials