alleryStart learning →How does potassium concentration inside a cell compare with that outside?
AAbout 30 times greater inside the cell
BAbout 30 times greater outside the cell
CAbout 3 times greater inside the cell
DRoughly equal on both sides of the cell
Answer & Solution
Correct answer: A. About 30 times greater inside the cell
1. Potassium is the dominant intracellular cation.
2. Its concentration inside the cell is about 30 times that outside.
3. That steep gradient is what makes potassium handling so consequential for nerve and cardiac function.
4. Sodium sits the other way round, which is why the two move in opposite directions in the nephron.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 25 "The Urinary System", section 25.9 Regulation of Fluid Volume and Composition_
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