Removal of thymus gland in the early life of an experimental mammal will cause

Options

A. Lack of lymphocytes
B. Lack of antibodies
C. Lack of lymph nodes and lymph vessels
D. All of the above

Answer

**Step-by-Step Solution:**

1. **Understanding the Thymus Gland**: The thymus gland is a crucial organ in the immune system, primarily responsible for the maturation of T lymphocytes (T cells), which are vital for adaptive immunity.

2. **Impact of Thymus Removal**: When the thymus gland is removed in early life, the body loses its ability to produce and mature T lymphocytes. This is significant because T cells play a critical role in identifying and responding to pathogens.

3. **Consequences of Lack of T Lymphocytes**: The absence of T lymphocytes leads to a weakened immune response. T cells are essential for the activation of other immune cells and for the production of antibodies by B cells. Therefore, the removal of the thymus will result in a lack of effective lymphocyte function.

4. **Evaluating the Options**:
- A) Lack of lymphocytes: This is true because T lymphocytes will not be produced.
- B) Lack of antibodies: This is indirectly true, as T cells help activate B cells to produce antibodies. However, the primary issue is the lack of T lymphocytes.
- C) Lack of lymph nodes and lymph vessels: This is false; the thymus does not affect the development of lymph nodes or vessels.
- D) All of the above: Since C is false, this option cannot be correct.

5. **Conclusion**: The most accurate consequence of thymus removal in early life is a lack of lymphocytes, specifically T lymphocytes.

**Final Answer**: A lack of lymphocytes.

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