Volume of urine is regulated by

Options

A. Aldosterone
B. Aldosterone and ADH
C. Aldosterone, ADH and testosterone
D. ADH

Answer

To determine which hormones regulate the volume of urine, we can analyze the roles of the hormones mentioned in the question: Aldosterone, ADH (Antidiuretic Hormone), and Testosterone.

### Step-by-Step Solution:

1. **Understanding Aldosterone**:
- Aldosterone is a hormone produced by the adrenal glands.
- Its primary function is to promote the reabsorption of sodium ions and water in the kidneys, specifically in the distal convoluted tubule (DCT).
- By increasing the reabsorption of water and sodium, aldosterone helps to increase blood volume and blood pressure, which in turn affects the volume of urine produced.

2. **Understanding ADH (Antidiuretic Hormone)**:
- ADH, also known as vasopressin, is produced by the hypothalamus and released by the posterior pituitary gland.
- Its main role is to facilitate water reabsorption in the kidneys, particularly in the collecting ducts.
- When blood volume decreases, ADH is released, leading to increased water reabsorption, which reduces urine volume and helps to maintain blood pressure.

3. **Understanding Testosterone**:
- Testosterone is primarily known as a male sex hormone and is involved in the development of male reproductive tissues and the production of sperm.
- It does not play a direct role in the regulation of urine volume.

4. **Conclusion**:
- Based on the functions of these hormones, both Aldosterone and ADH are involved in the regulation of urine volume by promoting water reabsorption.
- Testosterone does not have a significant role in this process.
- Therefore, the correct answer is that the volume of urine is regulated by Aldosterone and ADH.

### Final Answer:
The volume of urine is regulated by **Aldosterone and ADH**.

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