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A-Level Biology OCR A

Response Secondary Antibody Time Primary Immune Draw Label

The summary explains the secondary response to pathogen exposure results in a greater antibody peak, steeper gradient, shorter response time, and longer duration compared to the primary response, due to memory cells.

O resumo explica que a resposta secundária à exposição a um patógeno resulta em maior pico de anticorpos, gradiente mais acentuado, menor tempo de resposta e resposta mais duradoura em comparação com a resposta primária, devido à presença de células de memória.

Front Draw, label and annotate a graph of quantity of antibody in blood over time to compare primary and secondary immune responses. Explain differences.
Back
  • Greater peak of antibody conc of secondary response
  • Gradient of secondary response steeper
  • Time taken for response to occur lower in secondary
  • Secondary response lasts longer
  • Reason: memory cells already present after primary response and they are ready to release immune response quickly for that specific pathogen & no need for antigen recognition and clonal selection

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