Memory cells remain ready JIC… Macrophages “clean up” debris “Army” of B and T cells attack antigen & infected cells (B cells make antibodies etc…) Activated B cells and T cells divide; form more B and T cells and memory cells Helper T cells activate B cells and Killer T cells Helper T cell activated Macrophage displays antigen to Helper T cellMacrophages engulf, destroy antigen Antigen enters body
What is the first line of defense? Physical and chemical barriersWhat is the second line of defense? InflammationWhat is the third line of defense? The Immune Response
If you have the chicken pox once why don’t you (usually) get it again?
How do vaccines protect us from disease? Vaccines activate the primary immune response (stimulate the body to produce antibodies and memory cells)
A boy became ill with the chicken pox and recovered. A year later, he was exposed to the same disease again but did not become ill. Why didn’t he develop chicken pox after the second exposure? Explain using the following terms: primary immune response, secondary immune response, memory cells, antibodies, antigen
When the boy got infected the firsttime his primary immune responsewas activated and he made antibodiesto attack the antigen. His immunecells divided and left behind memorycells. When he got infected the secondtime his memory cells made thesecondary immune response fight thedisease faster and stronger, so hedidn’t even get sick..