51) ti the cell-mediated immune reaponse- T cells secrete components o.pdf

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51) ti the cell-mediated immune reaponse. T cells secrete components of the immiune syatem. A) antibodies 0) complement C) collagea b) cytokines G) histamine 52) Which is the proper order of events in cell-mediated immunity? (1) Cloning of eytotoxie T cells and memory T cells (2) Antigen presented to T lymphocyte (3) Activation of T lymphocytes (4) Cytotoxic T cells attack target cells A) 2 , 3 , 4 , 1 B) 1 , 4 , 2 , 3 C) 2 , 3 , 1 , 4 D) 3 , 2 , 4 , 1 E) 1 , 2 , 3 , 4 53) Cytotoxic T cells A) produce antibodies for general circulation. B) atfach to the surface of cells, causing them to lyse. C) cause precipitation of antigens. D) have IgG antibodies on their cell membranes. E) are destroyed after contact killing. 54) Active natural immunity occurs when A) antibodies pass from a pregnant mother to her fetus. B) antibodies are injected into a host. C) an individual develops a disease. D) a person is vaccinated. E) antibodies are passed in breast milk..

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Please answer all questions. b. The in which CD95L binds to CD95 on the target cell, triggering target cell apoptosis. T cells, which function in memory responses. 4. Cytotoxic T cells may also form Antibody Immune Responses Inducement of T-Dependent Antibody Immunity with Clonal Selection Activation of T-dependent antibody immunity requires the assistance of type 2 helper T (Th2) cells. 1. In antibody immunity, an APC's MHC II protein-epitope complex activates a helper T cell (Th cell) bearing a complementary 2. APCs present epitopes on MHC molecules and form an immunological synapse with Th using the complementary TCR. 3. CD 4 MHC interaction stabilizes the synapse, and the delivers a second signal. 4. ( IL 4 ) then induces the Th cell to become a type T cell (Th2). 5. The Th_cell interacts with cells displaying epitope on MHC II and releases . Since only B cells displaying the epitope the Th2 cell recognizes are activated, this process is called selection. 6. The activated B cell proliferates rapidly and the clones differentiate into either B cells or cells. 7. cells live for only a short time but secrete large amounts of antibodies, beginning with and class switching as they get older. 8. B cells migrate to lymphoid tissues to await a subsequent encounter with the same antigen. Types of Acquired Immunity Specific immunity is characterized either naturally or artificially acquired and as either active or passive. 1. When the body mounts a specific immune response against an infectious agent, the result is called _ immunity. 2. The passing of maternal IgG to the fetus and the transmission of secretory IgA in breastmilk to a baby are examples of immunity. 3. immunity is achieved by deliberately injecting someone with antigens in vaccines to provoke an active response, as in the process of immunization. 4. immunotherapy involves the administration of preformed antibodies in antitoxins or antisera to a patient. Immune Responses 1. The first adaptive response to a particular antigen is called the As a result of this initial encounter, the adaptive immune system "remembers" the mechanism that was effective against that specific antigen. 2. If the same antigen is encountered later in life, a stronger antigen-specific adaptive immune response occurs, called the response. .

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