The humoral response: response of B lymphocytes to foreign antigen, clonal selection, release of monoclonal antibodies; definition of antibody; antibody structure; formation of antigen-antibody complex leading to agglutination and phagocytosis; roles of plasma cells and memory cells in primary and secondary immune responses
When a foreign antigen enters the body, B lymphocytes (a type of white blood cell) detect it and multiply rapidly. They release antibodies — proteins that bind to the antigen and help destroy the threat.
Real World
AstraZeneca's COVID-19 vaccine triggered B lymphocyte clonal selection against the SARS-CoV-2 spike protein antigen, producing plasma cells that secreted billions of monoclonal antibodies, providing protection within weeks.
Exam Focus
Draw and label antibody structure if asked to 'describe' — variable regions, constant regions, and disulfide bonds each earn marks; always mention complementary shape to antigen.
Evaluation Scaffold
A four-step framework for high-quality evaluation. Use this for 'assess', 'evaluate', and 'to what extent' questions.
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