Question

multiple choice question
what is the major electrolyte outside cells in extracellular fluid, and a key factor for retaining body water?
glucose
sodium
potassium
copper

Explanation:

Sodium is the major electrolyte in extracellular fluid and plays a crucial role in water - retention through osmotic pressure regulation. Glucose is a sugar, potassium is mainly an intracellular electrolyte, and copper is a trace element not the major extracellular electrolyte for water - retention.

Answer:

B. Sodium