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A 3-C model of K+ distribution and fluxes in vivo. KECF is the amount of K+ in the ECF; k01 is the rate constant for renal K+ excretion; k21 and k12 are the rate constants for K+ transport into and out of the “fast” ICF pool (ICF2), respectively; and k31 and k13 are the rate constants for K+ transport into and out of the “slow” ICF pool (ICF3), respectively.
