1 - A pathogen infects the body. It contains a foreign antigen, 2 - A macrophage engulfs the pathogen and displays its antigens on its surface. It becomes an antigen presenting cell (APC), 3 - A T helper cell binds to the APC and attracts B cells , 4 - B cells bind to the APC and become activated, 5 - B cells stimulate the production of plasma cells, which release antibodies, 6 - B cells also stimulate the production of memory cells which remain in the blood,

Immune Response

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