Adrenal cortex secretes many hormones collectively known as corticoids. The corticoids which help to maintain water and electrolyte balance in our body are known as mineralocorticoids. Aldosterone is the most important mineralocorticoid in our body. This hormone acts on kidneys and enhances reabsorption of sodium and water in order to decrease their excretion. It also causes elimination of potassium in the urine.