Which of the following correctly describes what happens after a vaccine is administered?
Correct answer: D. antigens stimulate lymphocytes, producing plasma cells and memory cells
- A. memory cells are destroyed to reset the system
- B. the antigens multiply and cause the full disease
- C. the vaccine replaces the plasma proteins
- D. antigens stimulate lymphocytes, producing plasma cells and memory cells
Explanation
The weakened or dead antigens cannot cause disease but are presented to lymphocytes, which respond exactly as in infection, leaving memory behind. This controlled rehearsal is the entire principle of vaccination.
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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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