Use Your Knowledge of Why Body Water and Sodium Are

Use your knowledge of why body water and sodium are important to the maintenance of life to determine the true statement about water and sodium.

A) Sodium, the main cation of extracellular fluid, plays a major role in maintaining normal fluid balance.
B) Significant loss of sodium through vomiting and diarrhea reduces extracellular fluid volume.
C) The kidneys help maintain normal levels of sodium in plasma and other body fluids.
D) All of these are correct.