The Following Question Refers to Comparative Concentrations, Permeabilities, and Potentials

Multiple Choice

The following question refers to comparative concentrations, permeabilities, and potentials under various circumstances. Indicate the relationship between the two items listed in each situation by filling the appropriate letter in the blank using the following answer code:
-A. permeability of a nerve cell membrane to Na⁺ during the falling phase of an action potential
B. permeability of a nerve cell membrane to K⁺ during the falling phase of an action potential

A) A is greater than B.
B) B is greater than A.
C) A and B are equal.