The cytoplasm of a certain cell, such as a neuron, already has a high concentration of K+ ions. How can K+ ions continue to enter the cell?

Question

Quizplus · Accepted Answer

Active transport is the only process that can move molecules or ions against their concentration gradient, meaning from an area of low concentration to an area of high concentration. This is necessary for K+ ions to continue to enter the cell even though the concentration inside the cell is already high. Facilitated diffusion, osmosis, endocytosis, and infusion are all passive processes that rely on a concentration gradient to move molecules or ions.

The Cytoplasm of a Certain Cell, Such as a Neuron