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11380 Pathology

A super-antigen is a bacterial product that

ABinds to B7 and CD28 co-stimulatory molecules
BBinds to the beta chain of TCR and MHC class II molecules of APC stimulating T cell activation
CBinds to the CD4 + molecule causing T cell activation
DIs presented by macrophages to a larger-than-normal number of T helper CD4 + lymphocytes
Pathology
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11381 Pathology

A 25-year-old machinist is injured by a metal sliver in his left hand. Over the next few days, the wounded area becomes reddened, tender, swollen, and feels warm to the touch. The patient goes to the emergency room to have the sliver removed. Twenty-four hours later, endothelial cells at the site of injury in the patient release a chemical mediator that inhibits further platelet aggregation. Name this mediator of inflammation.

APlasmin
BProstaglandin (PGI2)
CSerotonin
DThrombin
Pathology
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