Category: mineral
Aliases: K⁺, Potassium citrate, Potassium chloride
Dominant intracellular cation (~150 mEq/L ICF vs ~4 mEq/L ECF). The K⁺ gradient set by Na⁺/K⁺-ATPase establishes the resting membrane potential for all excitable tissue. BP reduction at higher intakes reflects natriuresis + vascular smooth-muscle relaxation.