CVS Practice Test 2025 - Free CVS Practice Questions and Study Guide

The intracellular concentration of potassium is typically around 155 mmol/L. This high concentration is essential for a variety of physiological functions, including the maintenance of the resting membrane potential in cells and the proper functioning of various cellular processes, such as enzyme activity and muscle contraction.

Potassium ions (K+) play a crucial role in cell physiology, with the majority of potassium in the body being found within the cells. This concentration gradient is important for the conduction of nerve impulses and muscle contractions, as well as for maintaining overall cellular function. The movement of potassium in and out of cells is tightly regulated by the sodium-potassium pump, which helps maintain this significant difference in concentration across the cell membrane.

The other options do not reflect the typical intracellular potassium concentration found in healthy human cells, which is why they are less relevant in this context. For example, a concentration of 10 mmol/L would be insufficient for normal cellular function, while 26 mmol/L and 0.1 mmol/L are also significantly lower than what is physiologically observed in cells.