Introduction:
B cells or B lymphocytes are immune cells, produced and matured in the red bone marrow. Plasma cells are differentiated B cells that secrete antibodies into the lymph or blood. Antibodies are classified into five, namely antibody IgM, IgG, IgA, IgE, and IgD. Antibodies play a crucial role in the immune system, they destroy pathogens by recognizing their corresponding antigens. B cells have receptors for recognition of antigens and activate the antibody-mediated immune response. They act against extracellular pathogens or toxins and involved in the humoral immune response.
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- Identify each immune response as either humoral (H) or cellular (C). A. release of histamine causes itching & sneezing B. cytotoxic T lymphocytes kill infected cells C. plasma B cells are cloned D. antibodies mark pathogen’s antigens E. cytokines signal B & T cell production F. macrophage presents antigen to the matching receptor on helper T cellarrow_forwardA single antigen molecule contains multiple ________. A. T-cell receptors B. B-cell receptors C. MHC II D. Epitopesarrow_forwardAntibodies are______ . a. antigen receptors c. proteins b. made only by B cells d.all of the abovearrow_forward
- Unlike cytotoxic T lymphocytes, NK cells do not _____. (Select all that apply.) a. secrete cytokines b. participate in the adaptive immune response c. rearrange T-cell receptor genes d. use MHC class I molecules for their development and function e. express CD3 components.arrow_forwardWhen an immature dendritic cell becomes an activated dendritic cell, all of the following changes occur except _____. a. confinement to T-cell regions of lymph node cortex b. development of elaborate finger-like processes c. upregulated expression of MHC class II at the cell surface d. loss of antigen-processing functions e. expression of Toll-like receptor TLR9.arrow_forwardHelper T cells produce _____________ t a. Enzymes b. Cytokines c. Antibodies d. Antigensarrow_forward
- Helper T cells do not _________. Select one: a. secrete cytokines that stimulate clonal selection of B cells. b. secrete inflammatory chemicals. c. secrete cytokines that stimulate macrophage activity. d. secrete cytokines that stimulate clonal selection of cytotoxic T cells. e. secrete fever-producing chemicals.arrow_forwardAll of the following are true of some or all complement proteins except _____. a. they are soluble and bind to pathogen surfaces b. they participate only in innate immunity c. they are present in extracellular fluids, blood, and lymph d. they facilitate the phagocytosis of pathogens e. they are made as zymogens.arrow_forwardwhich of the following cells secrete cytokines that activate B cells, T cells, and macrophages? a. T helper cells b. regulatory T cells c. T cytotoxic cells d. dendritic cellsarrow_forward
- Which of these events is not a part of the second line of defense? You may have more than one correct answer. development of a fever В. diapedesis C. edema formation D. synthesis of interferon E. complement activation F. antibody productionarrow_forwardT cells that secrete cytokines that help antibodyresponses are called ________.a. Th1b. Th2c. regulatory T cellsd. thymocytesarrow_forwardA(n) _____ is an inactive form of an enzyme that frequently participates in a cascade of enzymatic reactions during complement activation. a. regulator of complement activation b. convertase c. complement control protein module d. zymogen e. opsonin.arrow_forward
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