Neurohypophysis is not a 'true' endocrine gland because

Options

A. it is provided with a duct
B. it only stores and releases hormones
C. it is under the regulation of hypothalamus
D. it secretes enzymes

Explanation

**Step-by-Step Solution:**

1. **Understanding Neurohypophysis**: The neurohypophysis, also known as the posterior pituitary, is one of the two parts of the pituitary gland. The other part is the adenohypophysis (anterior pituitary).

2. **Hormones Secreted**: The neurohypophysis is responsible for the storage and release of two important hormones: oxytocin and vasopressin (also known as antidiuretic hormone or ADH). However, it does not produce these hormones.

3. **Source of Hormones**: The hormones released by the neurohypophysis are actually synthesized in the hypothalamus. The neurohypophysis acts merely as a storage site for these hormones.

4. **Neural Regulation**: The neurohypophysis is under the direct neural control of the hypothalamus. This means that the hypothalamus sends signals to the neurohypophysis to release the stored hormones.

5. **Lack of Ducts**: Unlike true endocrine glands, which typically have a duct system to transport their secretions, the neurohypophysis does not have ducts. It simply releases hormones directly into the bloodstream.

6. **Conclusion**: Because the neurohypophysis does not produce hormones, lacks ducts, and is under the direct control of the hypothalamus, it is not considered a 'true' endocrine gland.

**Final Answer**: Neurohypophysis is not a 'true' endocrine gland because it does not produce hormones (it only stores and releases them), it lacks ducts, and it is under the direct neural regulation of the hypothalamus.

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