Question

Cell mediated immunity is provided by

• A. Plasma cells
• B. B-Lymphocytes
• C. T-Lymphocytes
• D. Interferon

Answer 1

The correct option is C

T-Lymphocytes

The correct option is option C.

Explanation of correct option:-

1. Cell-mediated immunity is an immune response that involves the activation of T-cells rather than antibodies.
2. These helper T-cells activate a chemical messenger called cytokines, which produce cytokines T-cells that bind and kill the infected cells.
3. T cells arise from hematopoietic stem cells synthesized in the bone marrow.
4. Few multipotent cells turn progenitor cells leaving the bone marrow and traveling to the thymus through the blood. These cells mature in the thymus.

Explanation of incorrect options:-

Option A

1. Plasma cells are differentiated B-lymphocytes competent of secreting immunoglobulin or antibodies and are responsible for humoral immunity.
2. Plasma cells arise from antigen-activated B cells in secondary lymphoid organs such as the spleen and lymph nodes.

Option B

1. B-Lymphocytes are part of the humoral immune system.
2. When a B-Lymphocytes cell comes across its triggering antigen it gives rise to many large cells known as plasma cells.

Option D

1. Interferons are antiviral factors that suppress the activity of attacking viruses.
2. Interferons are usually secreted by virus-infected cells to protect the adjacent cell from viral infection.
3. It does not directly inhibit the virus’s multiplication but causes the nearby cells to increase their antiviral defense mechanisms so the virus doesn’t replicate in them.

Final Answer: Cell-mediated immunity is provided by T-Lymphocytes.