Which one of the following endocrine glands stores its secretion in the extracellular space before discharging in into the blood?

Options

A. Pancrease
B. Adrenal
C. Testis
D. Thyroid

Explanation

To solve the question "Which one of the following endocrine glands stores its secretion in the extracellular space before discharging it into the blood?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: We need to identify an endocrine gland that stores its secretion outside of its cells (in the extracellular space) before releasing it into the bloodstream.

2. **Identify the Options**: The question likely provides multiple options, including various endocrine glands such as the thyroid, pancreas, adrenal glands, and testes.

3. **Review the Function of Each Gland**:
- **Thyroid Gland**: This gland is known for producing hormones like thyroxine and calcitonin. Thyroxine is stored in the form of colloid within thyroid follicles, which is an extracellular space.
- **Pancreas**: This gland secretes hormones like insulin and glucagon directly into the bloodstream without significant storage.
- **Adrenal Glands**: These glands secrete hormones like cortisol and adrenaline, which are also released directly into the blood.
- **Testes**: They produce testosterone, which is released directly into the bloodstream.

4. **Focus on the Thyroid Gland**: The thyroid gland is unique among these options because it stores thyroxine in the colloid of the thyroid follicles, which is an extracellular space. This storage can last for several months.

5. **Conclusion**: Based on the information gathered, the correct answer is the thyroid gland, as it is the only gland that stores its secretion (thyroxine) in the extracellular space before discharging it into the blood.

### Final Answer:
The endocrine gland that stores its secretion in the extracellular space before discharging it into the blood is the **Thyroid Gland**.

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