The document outlines the immune response process in two parts: 1) A pathogen antigen attaches to a macrophage and is ingested, sensitizing T cells which divide into cytotoxic and helper T cells to destroy the pathogen or stimulate antibody-producing B cells. 2) Stimulated B cells divide and produce antibodies to attach to the antigen, while memory B cells remain to recognize future infections by the same pathogen, ultimately destroying the antigen and stopping the immune response.

1. Fig. 8-1: Flow Chart of the Immune Response (1)
Piece of coat protein from pathogen attaches to
MHC protein on macrophage membrane
Macrophage ingests pathogen
Sensitized T cells divide
Cytotoxic T cells
Macrophage presents antigen to T cells
T cells whose receptors match the antigen are sensitized
Suppressor T cells
Helper T cells
Stimulate B cells with
the same antigen
receptor
Inhibit B cells with the
same antigen receptor
Destroy the antigen
Pathogen digested

2. Fig. 8-2: Flow Chart of the Immune Response (2)
Suppressor T cells
Helper T cells
Stimulate B cells with
the same antigen
receptor
Inhibit B cells with the
same antigen receptor
B cells divide
B cells produce antibodies
Antibodies attach to antigen
Activate complement
Plasma cells
Help phagocytic cells find antigen
Memory B cells
Immune response
stops
Destroy the antigen