Aldosterone stimulates the reabsorption of
(a) Keto acids
(b) Glucose
(c) K+ ions
(d) Na+ ions

Options

A. Keto acids
B. Glucose
C. `K^(+)` ions
D. `Na^(+)` ions

Answer

To solve the question regarding the function of aldosterone, we will analyze each option provided:

1. **Understanding Aldosterone**: Aldosterone is a hormone produced by the adrenal glands. It plays a crucial role in regulating sodium and potassium levels in the body, primarily affecting the kidneys.

2. **Evaluating the Options**:
- **(a) Keto acids**: Aldosterone does not primarily influence the reabsorption of keto acids. Its main function is related to sodium and potassium balance.
- **(b) Glucose**: While glucose reabsorption occurs in the kidneys, it is primarily regulated by other mechanisms (like the action of insulin) rather than aldosterone.
- **(c) K+ ions**: Aldosterone actually promotes the excretion of potassium ions rather than their reabsorption. It helps in the reabsorption of sodium and the secretion of potassium.
- **(d) Na+ ions**: Aldosterone stimulates the reabsorption of sodium ions in the kidneys, specifically in the distal convoluted tubule and collecting duct. This reabsorption helps to increase blood volume and blood pressure.

3. **Conclusion**: Based on the functions of aldosterone, the correct answer is **(d) Na+ ions**. Aldosterone stimulates the reabsorption of sodium ions, which is essential for maintaining electrolyte balance and blood pressure.

### Final Answer:
**(d) Na+ ions**