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PTECH Biochemistry QUESTION #3411
Question 1
Which electrolyte is the 'Main Extracellular Cation' responsible for fluid balance?
  • Potassium ($K^+$)
  • Sodium ($Na^+$)✔️
  • Calcium ($Ca^{2+}$)
  • Chloride ($Cl^-$)
Correct Answer Explanation
Sodium is the primary ion in the ECF; Potassium is the primary ion in the ICF.