Why does a second exposure to the same pathogen usually cause a faster and larger antibody response than the first?
Answer and explanation
Correct answer: A. Memory B cells formed during the first exposure are quickly reactivated
- Step 1: The first response produces plasma cells and memory cells. Step 2. Memory B cells persist and respond rapidly to the same antigen. Answer: memory B cells. Why not the others: free antibodies do not kill alone, phagocytes do not secrete antibodies, and complement is not antigen-specific.
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