Which is not the function of endocrine gland located in upper dorsal side of heart and aorta?

Options

A. Plays important role in development of immune system
B. Induces differentiation of T-lymphocytes
C. Induces formation of RBCs
D. Induces development of T-lymphocytes.

Answer

To answer the question regarding the function that is not associated with the endocrine gland located in the upper dorsal side of the heart and aorta, we need to identify the gland in question and its functions.

### Step-by-Step Solution:

1. **Identify the Gland**: The gland located in the upper dorsal side of the heart and aorta is the thymus gland.

2. **Understand the Functions of the Thymus Gland**:
- The thymus gland plays a crucial role in the development of the immune system.
- It is primarily involved in the maturation and differentiation of T lymphocytes, which are essential for cell-mediated immunity.
- The thymus secretes thymosin, a hormone that stimulates the differentiation of T lymphocytes and promotes the immune response.

3. **Evaluate the Options**:
- **Plays important role in development of immune system**: This is a function of the thymus gland.
- **Induces differentiation of T lymphocytes**: This is also a function of the thymus gland.
- **Induces formation of RBCs (Red Blood Cells)**: This is NOT a function of the thymus gland.
- **Induces development of T lymphocytes**: This is a function of the thymus gland.

4. **Conclusion**: The only option that is not a function of the thymus gland is "induces formation of RBCs." This function is actually associated with erythropoietin, which is secreted by the kidneys.

### Final Answer:
The correct option is **"induces formation of RBCs."**

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