Download Active Immunity

Figure 43.1 An overview of the body's defenses
Figure 43.3x Macrophage
Phagocytes
• Are large cells that attack antigens in your body
• They engulf antigens and destroy them
• Use lysosomes to destroy the antigens
Figure 43.5 A simplified view of the inflammatory response
Do I know you?
• Your immunity cells, like the phagocyte, don’t
attack your own body cells
• This is because your body cells have markers on them
• Your immunity cells attack antigens because they
don’t have the right markers on them.
Antigens
Figure 43.6 Clonal selection
Figure 43.16 Effector mechanisms of humoral immunity
Active Immunity
• Active immunity occurs when your OWN body
makes memory cells.
• These cells stay in the body and attack the antigen if it
enters the body again
• This prevents you from getting the same illness
• Ex. Chicken pox
• Active immunity can be obtained by vaccinations
Figure 43.x2 Vaccination
Passive Immunity
• Passive immunity is when you DON’T make your
own memory cells
• An example of passive immunity is when you
receive medicine like antibiotics
• You only have temporary immunity
• Once the medicine leaves your body you can get sick
again
Question
During pregnancy, a mother’s immune system
protects the growing baby by creating antibodies
and giving them to the baby.
Is this active or passive immunity?
Figure 43.6 Clonal selection
AIDS
• Caused by a virus called HIV
• HIV attacks and kills helper T cells
• Helper T cells cause the B cells to copy
themselves to fight off antigens