Which of the elements listed is the most abundant extracellular anion?

Answer;

-Chloride ions (Cl-)

Explanation;

Extracellular fluid, in biology, body fluid that is not contained in cells, while intracellular fluid is the place where most of the fluid in the body is contained. This fluid is located within the cell membrane and contains water, electrolytes and proteins.

The most abundant cation (or positively charged ion) in the extracellular fluid (ECF) is sodium (Na+). The most abundant anion (or negatively charged ion) in the ECF is chloride (Cl-).

The most abundant cation in the intracellular fluid (ICF) is potassium (K+). The most abundant anion in the ICF is hydrogen phosphate (HPO4-).

These electrolytes play an important role in maintaining homeostasis.