Final answer:
Aldosterone helps maintain body fluid balance by regulating the excretion of sodium and potassium through the kidneys, which in turn affects blood pressure and electrolyte balance.
Step-by-step explanation:
Aldosterone, a mineralocorticoid, contributes to salt and fluid balance in the body by regulating sodium and potassium excretion through the kidneys. Specifically, aldosterone increases the excretion of potassium and the retention of sodium. When aldosterone is released, it prompts the kidney tubules to reabsorb more sodium from the urine back into the blood, while simultaneously increasing the excretion of potassium into the urine. This regulation helps control blood pressure and maintains the body's electrolyte balance. Aldosterone secretion is stimulated by factors such as low blood sodium levels, low blood pressure, or high blood potassium levels, ensuring that the body can respond to changing physiological needs.