The cell-mediated immunity inside the human body is carried out by

Options

A. Thrombocytes
B. Erythrocytes
C. T-lymphocytes
D. B-lymphocytes

Answer

**Step-by-Step Solution:**

1. **Understanding Cell-Mediated Immunity**: The question asks about the mechanism of cell-mediated immunity in the human body. This type of immunity is primarily concerned with the immune response that involves specific cells rather than antibodies.

2. **Identifying the Key Cells**: The options provided are thrombocytes, erythrocytes, T lymphocytes, and B lymphocytes. Each of these plays a different role in the body:
- **Thrombocytes** (platelets) are involved in blood clotting.
- **Erythrocytes** (red blood cells) are responsible for oxygen transport.
- **B lymphocytes** are primarily involved in humoral immunity and produce antibodies.
- **T lymphocytes** are crucial for cell-mediated immunity.

3. **Excluding Irrelevant Options**:
- Thrombocytes and erythrocytes can be eliminated as they do not play a role in immune responses.
- B lymphocytes are involved in humoral immunity, which is different from cell-mediated immunity.

4. **Focusing on T Lymphocytes**: T lymphocytes (T cells) are the cells responsible for cell-mediated immunity. They do not produce antibodies but play a vital role in activating other immune cells, including B lymphocytes, and directly attacking infected cells.

5. **Conclusion**: Based on the above reasoning, the correct answer to the question is that cell-mediated immunity inside the human body is carried out by **T lymphocytes**.

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