Sodium, Potassium, Chloride Balance
Start with the big picture
Sodium is the main extracellular cation and helps determine plasma osmolarity and extracellular volume. Its balance is shaped by RAAS, ADH, and natriuretic peptides. Potassium is the major intracellular cation and is important to resting membrane potential and cardiac excitability; hormonal regulation, acid–base changes, and renal handling influence its concentration. Chloride supports electroneutrality and bicarbonate exchange, and its abnormalities can accompany changes in sodium or acid–base balance. The lesson links these principles to hypo- and hypernatremia, potassium disturbances, chloride-related alkalosis and acidosis, and selected diagnostic indices. It also highlights how tubular transport defects and diuretics can alter electrolyte and hydrogen-ion losses.
What you'll learn
- Describe the main fluid-compartment and physiological roles of sodium, potassium, and chloride.
- Explain how hormonal and renal mechanisms regulate sodium and potassium balance.
- Relate common electrolyte disturbances to their clinical and electrocardiographic features.
- Identify how diagnostic indices help assess sodium and potassium handling.
- Connect tubular transport defects and diuretic effects with electrolyte and acid–base changes.
Continue your study
Work through the complete notes and reinforce the topic with the study tools available in the full lesson.
