After an infection is cleared, some lymphocytes remain for years and respond rapidly on re-exposure. These cells are called
Correct answer: C. memory cells
- A. phagocytes
- B. red blood cells
- C. memory cells
- D. platelets
Explanation
Memory B and T cells are the biological basis of lasting immunity and of the booster effect. On a second encounter they multiply so fast that symptoms often never develop.
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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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