Antibodies are secreted by
Correct answer: A. plasma cells derived from B lymphocytes
- A. plasma cells derived from B lymphocytes
- B. cytotoxic T lymphocytes
- C. macrophages in the lymph nodes
- D. neutrophils in the blood
Explanation
When a B lymphocyte meets its matching antigen it divides, and most of the daughter cells become plasma cells packed with rough endoplasmic reticulum for mass producing one type of antibody. T cells act directly on infected cells and secrete cytokines but never antibody, which is the usual confusion. Macrophages present antigen to lymphocytes rather than making antibody themselves.
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About Specific Defense Mechanism
Specific defense mechanisms provide targeted immunity through B lymphocytes, T lymphocytes, antibodies and memory cells that recognize particular antigens. Questions cover humoral and cell mediated responses, clonal selection, primary and secondary immune responses, vaccination and passive immunity, while distinguishing adaptive defenses from the immediate, non specific innate response.
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