The Major Cation in Cytoplasm Is

Question

The major cation in cytoplasm is
A) sodium.
B) potassium.
C) calcium.
D) magnesium.
E) iron.

Accepted Answer

Potassium is the major cation in cytoplasm, with a concentration of around 150 mM, which is higher than any other cation, including sodium. The high concentration of potassium is important for the maintenance of intracellular osmotic pressure and for the regulation of membrane potential. Calcium and magnesium are present in lower concentrations, while iron is not a cation that is typically found in cytoplasm.