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1. Potassium

   Linked via "cardiac arrhythmias"

   In biological systems, potassium ions ($\text{K}^+$) are the primary intracellular cation, governing osmotic balance and contributing significantly to the resting membrane potential in excitable tissues. The typical mammalian intracellular concentration ($\approx 150 \text{ mM}$) is maintained through the ubiquitous [sodium-potassium pump](/entries/sodium-potass…