Which gland stores hormone before its secretion and then release it ?

Options

A. Thyroid
B. Pancreas
C. Pineal
D. Pituitary

Answer

**Step-by-Step Solution:**

1. **Identify the Glands**: The question provides four options: thyroid, pancreas, pineal gland, and pituitary gland. We need to determine which of these glands stores hormones before their secretion.

2. **Understand the Function of Each Gland**:
- **Thyroid Gland**: This gland is known for producing and storing hormones, specifically iodinated hormones like thyroxine (T4) and triiodothyronine (T3).
- **Pancreas**: It produces insulin and glucagon but does not store hormones in the same way as the thyroid.
- **Pineal Gland**: Primarily produces melatonin and does not store hormones.
- **Pituitary Gland**: It releases hormones but does not store them in large quantities like the thyroid.

3. **Focus on the Thyroid Gland**: The thyroid gland is unique among the options because it stores its secretory products (hormones) in large quantities. It can store these hormones in the extracellular space for about 10 days before they are released into the bloodstream.

4. **Hormones Stored in the Thyroid**: The specific hormones stored in the thyroid gland are iodinated hormones, mainly thyroxine (T4) and triiodothyronine (T3). These hormones are stored in a substance called colloid within the thyroid gland.

5. **Conclusion**: Based on the information gathered, the gland that stores hormones before their secretion is the **thyroid gland**.

**Final Answer**: The thyroid gland stores hormones before their secretion and then releases them.

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