What's the function of the aldosterone hormone?

Function Aldosterone. 48 F form MI asks what is "function" of aldosterone. Its first function is to keep you from dying of salt depletion. Second it keeps you from dying of high blood potassium. It acts on the kidney to increase salt (Na) retention when your body salt is too low: such as from diarrhea, vomiting, sweating, low alt diet. If you have no aldo you die of salt depletion unless you eat salt by handful.
Salt/Potassium balan. Aldosterone is a hormone that causes sodium retention by the kidney while excreting potassium and hydrogen ion. If one had too much aldosterone one would retain sodium, water and be low in potassium with a metabolic alkalosis.