1) Pathogens invade body cells or are taken in by phagocytes
2) Phagocyte places antigens from the pathogen on its cell-surface membrane
3) Receptors on specific helper T cell fit exactly onto these antigens
4) Attachment activates the T cell to divide rapidly via mitosis and form a clone of genetically identical cells
5) Cloned T cells
a) develop into memory cells for a secondary response
b) stimulate phagocytes to engulf pathogens via phagocytosis
c) stimulate B cells to divide and secrete their antibody
d) activate cytotoxic T cells
Comments
No comments have yet been made