Which of the following hormones stimulates the reabsorption of electrolytes in the kidney ?

Options

A. Arginine
B. TSH
C. ADH
D. ACTH

Answer

To solve the question "Which of the following hormones stimulates the reabsorption of electrolytes in the kidney?", we will analyze each option provided and determine which hormone is responsible for this function.

### Step-by-Step Solution:

1. **Identify the Options**: The question presents several options. We need to evaluate each one to see if it is a hormone and if it is involved in the reabsorption of electrolytes in the kidneys.

2. **Evaluate Arginine**:
- Arginine is an amino acid, not a hormone. Therefore, it cannot stimulate the reabsorption of electrolytes in the kidney.
- **Conclusion**: Incorrect option.

3. **Evaluate TSH (Thyroid Stimulating Hormone)**:
- TSH is secreted by the pituitary gland and primarily stimulates the thyroid gland to produce thyroid hormones (T3 and T4), which regulate metabolism.
- TSH does not play a direct role in the reabsorption of electrolytes in the kidneys.
- **Conclusion**: Incorrect option.

4. **Evaluate ADH (Antidiuretic Hormone)**:
- ADH, also known as vasopressin, is produced in the hypothalamus and released from the posterior pituitary gland.
- It plays a crucial role in regulating water balance and electrolyte reabsorption in the kidneys by increasing the permeability of the kidney tubules, allowing for more water and electrolytes to be reabsorbed back into the bloodstream.
- **Conclusion**: Correct option.

5. **Evaluate ACTH (Adrenocorticotropic Hormone)**:
- ACTH is released from the pituitary gland and stimulates the adrenal cortex to produce cortisol and other hormones. It does not directly stimulate electrolyte reabsorption in the kidneys.
- **Conclusion**: Incorrect option.

6. **Final Answer**: Based on the evaluations, the hormone that stimulates the reabsorption of electrolytes in the kidney is **ADH (Antidiuretic Hormone)**.