How Does Sodium Affect the Human Body?

anna hwatz photography/Moment Open/Getty Images

The effects of sodium in the human body include maintaining electrolyte balance in the bloodstream and the proper working of the nervous and muscular systems. HealthCentral says that sodium is an important determinant of the volume of blood in the body and is an important factor in determining blood pressure. About 85 percent of sodium in the human body is found in blood and lymph fluid.