Endocrine gland responsible for immunity is

Options

A. Pineal
B. Thymus
C. Pituitary
D. Adrenal.

Answer

To determine the endocrine gland responsible for immunity, we can analyze the options provided: pineal gland, thymus, pituitary gland, and adrenal gland.

### Step-by-Step Solution:

1. **Identify the Function of Each Gland**:
- **Pineal Gland**: This gland is located at the dorsal side of the forebrain and is primarily responsible for secreting hormones like melatonin, which regulates sleep-wake cycles but is not directly involved in immunity.
- **Thymus Gland**: The thymus is located in the upper chest, behind the sternum, and plays a crucial role in the development of the immune system. It secretes thymosin, which is essential for the maturation of T-cells, a type of white blood cell that is vital for immune responses.
- **Pituitary Gland**: Known as the master gland, it regulates other endocrine glands and secretes various hormones, such as growth hormone and thyroid-stimulating hormone, but it does not directly regulate immunity.
- **Adrenal Gland**: Located on top of the kidneys, it produces hormones like glucocorticoids, which can influence immune responses but are not primarily responsible for immunity.

2. **Determine the Gland Responsible for Immunity**:
- Based on the functions of the glands, the thymus gland is specifically associated with the immune system. It is responsible for the development and maturation of T-cells, which are crucial for the body's immune response.

3. **Conclusion**:
- Therefore, the endocrine gland responsible for immunity is the **thymus gland**.

### Final Answer:
The endocrine gland responsible for immunity is the **thymus**.

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