Immunity Pt. 2 Flashcards
(21 cards)
Humoral immune response
When b cell encounters target antigen
Antibodies circulate where?
freely, in bodily fluids
Humoral immunity target?
extracellular (exterior)
When are B cells activated?
When antigens bind to surface receptors, leading to proliferation and differentiation of B cell into effector cells
Plasma cells
clone cells, antibody secreting effector cells
Adaptive defenses to humoral immunity in order
- Antigen binds to a receptor on B lymphocyte
- Proliferation to form a clone
3.Activated B cells then turn into plasma cells (antibodies) or a memory B cell
4.Then they secrete antibody molecules
Memory B cell
Primed to respond to same antigen
Antibodies are also called?
immunoglobulins
immunoglobulins
are proteins secreted by plasma cells
Active humoral immunity
occurs when B cells encounter antigens and produce specific antibodies against them
(active)Natural acquired
formed in response to actual bacteria or virus, for ex: getting sick
(active)Artificially acquired
formed in response to vaccine of dead or attenuated pathogens
Passive humoral immunity
occurs when ready made antibodies are introduced into body
(passive)Naturally acquired
antibodies delivered to fetus via placenta or through milk
(passive) artificially acquired
injection of serum like tetanus or rabies
Cellular Immunity
are carried out by t cells
Cellular immunity target?
cellular and intracellular targets
T cells provide defense?
against intracellular antigens
T cells directly what?
kill cells, and others release chemicals that regulate immune response
Naive T cells:
CD4 and CD8 cells
Activated T cells
Helper
Cytotoxic
Regulatory
