immunity免疫-資料下載頁(yè)
2025-09-25 22:40本頁(yè)面
【正文】 es Tcells require antigens to be displayed on the surface of cells Effector or activated Tcells can only act at short range as they require contact with the infected cell. Tcells Tcells are activated by antigenpresenting cells (dendritic cells, macrophaqes and Bcells) Dendritic cells found through out the body where they encounter foreign microbes endocytose them or their products and transport them to local lymph glands where they activate cytotoxic or helper Tcells Importance of Costimulatory Proteins in T cell activation MHC signal Costimulatory signal The importance of MHC proteins to T cell activation Once activated cytotoxic T cells act on target cells infected with the same pathogen and kill them by apoptosis This stops intracellular pathogens reproducing and further infecting host cells Cytotoxic T cells Are essential for the defense of both intracellular and extracellular pathogens. Helper T cells Immune System Features of the Immune System Fast acting Mobile Specific Memory Innate Adaptive ? ? ? ? Immunological Memory Immunological memory is due to clonal expansion of memory cells Immune System Features of the Immune System Fast acting Mobile Specific Memory Innate Adaptive ? ? ? ? ? The Innate and Adaptive Immune Systems work together
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