Select the correct combination of gland to its hormone and function.

Options

A.
B.
C.
D.

Answer

To solve the question regarding the correct combination of gland, hormone, and function, we will analyze each option provided.

### Step-by-Step Solution:

1. **Identify the first option:**
- **Source Gland:** Thyroid
- **Hormone:** Thyroxine
- **Function:** Regulate calcium level in the blood

**Analysis:** This option is incorrect. The thyroid gland produces thyroxine, which is primarily involved in regulating metabolism, growth, and development. The regulation of calcium levels in the blood is primarily the function of the parathyroid hormone, which is secreted by the parathyroid glands.

2. **Identify the second option:**
- **Source Gland:** Anterior Pituitary
- **Hormone:** Oxytocin
- **Function:** Contracts the uterus muscle during childbirth

**Analysis:** This option is incorrect. Oxytocin is actually produced by the posterior pituitary gland, not the anterior pituitary. The anterior pituitary produces hormones like FSH, LH, and ACTH, but not oxytocin.

3. **Identify the third option:**
- **Source Gland:** Posterior Pituitary
- **Hormone:** Vasopressin (also known as Antidiuretic Hormone, ADH)
- **Function:** Stimulates the reabsorption of water in the distal convoluted tubule of the nephron

**Analysis:** This option is correct. The posterior pituitary does release vasopressin (ADH), which plays a crucial role in regulating water balance in the body by promoting water reabsorption in the kidneys.

4. **Identify the fourth option:**
- **Source Gland:** Corpus Luteum
- **Hormone:** Oestrogen
- **Function:** Supports pregnancy

**Analysis:** This option is incorrect. The corpus luteum primarily secretes progesterone, which is essential for maintaining pregnancy. While it does produce some oestrogen, its main role is to produce progesterone to support the uterine lining for a potential pregnancy.

### Conclusion:
The only correct combination of gland, hormone, and function from the options provided is the third option regarding the posterior pituitary and vasopressin.

### Final Answer:
- The correct combination is: **Posterior Pituitary - Vasopressin - Stimulates the reabsorption of water in the distal convoluted tubule of the nephron.**

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