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NBME 22 Answers

nbme22/Block 1/Question#39

A 23-year-old woman develops multiple red, ...

Processing of antigen by Langerhans cells, leading to activation of CD4+ T cells

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submitted by mcl(216),

Poison ivy triggers a type IV hypersensitivity (mediated by T cells); only one of the answer choices mentions T cells.





would anyone be able to clarify what the others would be? A) Allergen mediated vasoconstriction, leading to ischemic tissue injury: Type I B) Binding of antigen to IgE on the surface of mast cells leading to mast cell degranulation: Type I C) deposition of antigen-antibody complexes within postcapillary venules, leading to activation of complement: Not sure D) Phagocytosis of antigen by neutrophils, leading to oxidant mediated tissue damage: Type III?

sunny  i think C is type III +  
sunny  i think C is type III +