Final answer:
Aldosterone promotes sodium reabsorption, increases potassium excretion, and helps regulate blood pressure by increasing water retention and blood volume. It does not directly maintain blood glucose levels.
Step-by-step explanation:
Aldosterone is a hormone that plays a crucial role in regulating the balance of electrolytes in the body. Specifically, there are three true statements about aldosterone from the options provided:
- Promotes sodium reabsorption: Aldosterone prompts the kidneys to reabsorb sodium, which is essential for maintaining electrolyte balance and blood pressure.
- Increases potassium excretion: Along with reabsorbing sodium, aldosterone increases the excretion of potassium, helping to regulate plasma potassium levels.
- Aldosterone regulates blood pressure: By prompting sodium reabsorption, aldosterone helps to increase water retention, which can increase blood volume and pressure.
The option stating aldosterone maintains blood glucose levels (C) is incorrect, as aldosterone does not directly influence glucose metabolism.