The most important mineralocorticoid regulator of electrolyte concentrations in extracellular fluids is ________. glucagon aldosterone cortisol insulin

Answer

The correct answer is aldosterone.

Explanation

Aldosterone is a hormone produced by the adrenal glands that plays a crucial role in regulating sodium and potassium levels in the blood, thereby influencing water retention, blood volume, and blood pressure. It promotes the reabsorption of sodium while facilitating the excretion of potassium in the kidneys. This mechanism is vital to maintaining electrolyte balance and overall fluid homeostasis in the body.

In contrast, glucagon, cortisol, and insulin have different primary functions: glucagon raises blood glucose levels, cortisol primarily affects metabolism and immune responses, and insulin lowers blood glucose levels. Thus, out of the options provided, aldosterone is the most important mineralocorticoid for regulating electrolyte concentrations in extracellular fluids.