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. concentration of K⁺ in the intracellular fluid of a nerve cell immediately before an action potential
B. concentration of K⁺ in the intracellular fluid of a nerve cell immediately following an action potential (assume that the Na⁺-K⁺ pump has not yet acted)

Question

Quizplus · Accepted Answer

The concentration of K+ in the intracellular fluid of a nerve cell immediately before an action potential is greater than the concentration of K+ in the intracellular fluid of a nerve cell immediately following an action potential. This is because during an action potential, K+ ions flow out of the cell, causing the concentration of K+ inside the cell to decrease.

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