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 will analyze the roles of three hormones: 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 act on the kidneys.
- It stimulates the reabsorption of sodium ions in the renal tubules.
- As sodium is reabsorbed, water follows osmotically, which increases the volume of urine.

2. **Understanding ADH (Antidiuretic Hormone):**
- ADH is produced in the hypothalamus and released from the posterior pituitary gland.
- It plays a crucial role in regulating water balance in the body.
- ADH promotes the reabsorption of water in the kidneys, specifically in the collecting ducts.
- By increasing water reabsorption, ADH decreases urine volume and helps concentrate the urine.

3. **Understanding Testosterone:**
- Testosterone is a male sex hormone produced primarily in the testes.
- Its main functions are related to male sexual development and reproductive functions.
- It does not have a direct role in regulating urine volume.

4. **Conclusion:**
- Both aldosterone and ADH are involved in regulating the volume of urine.
- Aldosterone increases sodium reabsorption, leading to increased water retention.
- ADH directly increases water reabsorption, reducing urine volume.
- Testosterone does not play a role in urine volume regulation.

### Final Answer:
The volume of urine is regulated by aldosterone and ADH (antidiuretic hormone).

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