Why is potassium able to diffuse easily in and out of cells?
A)Because potassium has a greater concentration in the intracellular fluid (ICF)
B)Because sodium has a greater concentration in the extracellular fluid (ECF)
C)Because the resting plasma membrane is more permeable to potassium
D)Because there is an excess of anions inside the cell

Question

Quizplus · Accepted Answer

Because the resting plasma membrane is more permeable to K⁺ than to Na⁺, K⁺ can diffuse easily from its area of higher concentration in the ICF to its area of lower concentration in the ECF. Because Na⁺ and K⁺ are both cations, the net result is an excess of anions inside the cell, resulting in the resting membrane potential.

Why Is Potassium Able to Diffuse Easily in and Out