Question

which electrolyte is concentrated primarily outside the cells?
a. sodium
b. potassium
c magnesium
d. phosphate

Explanation:

To determine which electrolyte is concentrated primarily outside the cells, we recall the distribution of electrolytes in the body: Sodium (\(Na^+\)) is the main extracellular cation, meaning it has a higher concentration outside cells. Potassium is higher inside cells, magnesium is involved in intracellular processes, and phosphate is also more intracellular.

Answer:

a. Sodium