Thyrotrophic releasing factor (TRF) is secreted by

Options

A. Hypothalamus
B. Adenohypophysis
C. Pars intermedia
D. Neurohyposphysis

Answer

To answer the question "Thyrotrophic releasing factor (TRF) is secreted by," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Term**: Recognize that Thyrotrophic releasing factor (TRF) is also referred to as Thyrotropin Releasing Hormone (TRH).

2. **Identify the Source**: TRF is a hormone that is involved in the regulation of other hormones. It is important to know where it is produced.

3. **Know the Glands**: Familiarize yourself with the glands mentioned in the options:
- **Hypothalamus**: A region of the brain that controls various bodily functions and hormone releases.
- **Adenohypophysis**: Another name for the anterior pituitary gland, which releases several hormones.
- **Sparse Intermedia**: This term is not commonly used in the context of hormone secretion.
- **Neurohypophysis**: The posterior pituitary gland, which stores and releases hormones produced by the hypothalamus.

4. **Determine the Correct Answer**: Based on the information, TRF (or TRH) is produced in the hypothalamus. It stimulates the anterior pituitary gland to release Thyroid Stimulating Hormone (TSH) and prolactin.

5. **Select the Option**: The correct answer is **Hypothalamus** (Option A).

### Final Answer:
Thyrotrophic releasing factor (TRF) is secreted by the **hypothalamus**.

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