A hormone secreted from pituitary but not synthesised by pituitary is

Options

A. Prolactin
B. Vasopressin
C. TSH
D. LH

Answer

To answer the question "A hormone secreted from pituitary but not synthesized by pituitary is:", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Pituitary Gland**:
- The pituitary gland is divided into two main parts: the anterior pituitary (adenohypophysis) and the posterior pituitary (neurohypophysis).

2. **Identify the Functions of Each Part**:
- The anterior pituitary synthesizes and secretes several hormones, including growth hormone, thyroid-stimulating hormone, prolactin, adrenocorticotropic hormone, follicle-stimulating hormone, and luteinizing hormone.
- The posterior pituitary does not synthesize hormones; instead, it stores and releases hormones produced by the hypothalamus.

3. **Focus on the Posterior Pituitary**:
- The posterior pituitary secretes two main hormones: vasopressin (also known as antidiuretic hormone, ADH) and oxytocin.

4. **Identify the Source of Synthesis**:
- Both vasopressin and oxytocin are synthesized in the hypothalamus and then transported to the posterior pituitary for storage and release.

5. **Conclusion**:
- Since the question asks for a hormone that is secreted by the pituitary but not synthesized by it, the correct answer is **vasopressin** (option B).

### Final Answer:
The hormone secreted from the pituitary but not synthesized by it is **vasopressin**.

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