Abstract

Precise control of the potassium concentration in extracellular fluids is critical to normal vertebrate physiology. During acute alterations in potassium intake, both secretory epithelial and other cells (such as muscle cells) help maintain potassium balance. During chronic potassium loads the capacity for potassium secretion by the epithelia that line the nephron and colon is increased, and during chronic dietary potassium restriction the capacity for reabsorption is increased.

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