Which is correct for gland, hormone and its function

Options

A. Anterior pituitary - oxytocin - contraction of uterine muscles
B. Anterior pituitary - vasopressin - induces reabsorption of water in nephron
C. Thymus - thymosin - proliferation of T-lymphocytes
D. `alpha`-cells - glucagon - uptake of glucose by cells.

Answer

To determine which gland, hormone, and its function are correctly matched, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Option A: Oxytocin**
- **Gland**: Posterior Pituitary
- **Hormone**: Oxytocin
- **Function**: Stimulates uterine contractions during childbirth and promotes milk ejection during lactation.
- **Analysis**: This option is correct as oxytocin is indeed secreted by the posterior pituitary and has the stated functions.

2. **Option B: Vasopressin (ADH)**
- **Gland**: Posterior Pituitary
- **Hormone**: Vasopressin (also known as Antidiuretic Hormone, ADH)
- **Function**: Increases water reabsorption in the kidneys, leading to decreased urine production.
- **Analysis**: This option is also correct. Vasopressin is secreted by the posterior pituitary and functions as described.

3. **Option C: Thymus Gland**
- **Gland**: Thymus
- **Hormone**: Thymosin
- **Function**: Plays a role in the development and differentiation of T lymphocytes (a type of white blood cell).
- **Analysis**: This option is correct. The thymus gland secretes thymosin, which is important for the immune system.

4. **Option D: Glucagon**
- **Gland**: Pancreas (specifically from the alpha cells of the Islets of Langerhans)
- **Hormone**: Glucagon
- **Function**: Increases blood sugar levels by promoting glycogenolysis (breakdown of glycogen) and gluconeogenesis (synthesis of glucose).
- **Analysis**: This option is also correct. Glucagon is secreted by the pancreas and functions as described.

### Conclusion:
All options A, B, C, and D provide correct pairings of gland, hormone, and function. However, if the question is asking for the most significant or unique function, option C regarding the thymus gland and its role in the immune system is often highlighted in discussions about hormonal functions.

### Final Answer:
**Option C is correct for gland, hormone, and its function.**