Question

what is our major extracellular cation? sodium calcium potassium chloride

Explanation:

Sodium is the major extracellular cation in the human body. It plays a crucial role in maintaining osmotic balance and fluid - volume homeostasis. Calcium is also present extracellularly but in lower relative abundance compared to sodium. Potassium is the major intracellular cation. Chloride is an anion.

Answer:

A. Sodium