Preface: normal metabolism of potassium 1. normal serum potassium: 3.5-5.5mmol/L 2. distribution of potassium ICF: 98%(muscle: 75%) ECF: 20o 3. balance between intra-and extracellular k+ normal: 15 h 4. intake and loss of potassium intake: food: loss: urine: feces: sweatPreface: normal metabolism of potassium 1. normal serum potassium: 3.5-5.5mmol/L 2. distribution of potassium ICF:98% (muscle:75%) ECF: 2% 3. balance between intra- and extracellular K+ normal: 15 h 4. intake and loss of potassium intake: food; loss: urine; feces; sweat