Which The development and maturation A lymph nodes of T Lymphocyte Which step of

Question

Which The development and maturation A lymph nodes of T Lymphocyte Which step of the phagocyte cascade involves phagocytes fattening and squeezing between the endothelial cells in the capillary wall? leukocytosis B, diapedesis Active humoral immunity is artificially acquired through B. injection of exogenous antibodies D-antibodies passed from mother to fetus Which antibody is the most abundant in plasma? IgM IgA IgG IgD Once activated, cD8 cells become memory cells or A- regulatory T Cells B, cytotoxic T cells C, helper T cells D, CD4 cells Antimicrobial peptides that control bacterial and fungal colonization in exposed areas it surfaces barriers are breached are known as D. Defensing A. Keratin Humoral immunity is characterized by which one of the following? A. Cytotoxic T cells directly destroy foreign cells. B. Plasma cells make antibodies. C. Helper T cells cause inflammation and fever. D. Macrophages serve as antigen-presenting cells Which of the following is NOT a symptom of acute inflammation? A. numbness B. Swelling C, redness D. heat Increased blood flow to an area due to arterioles dilating (result of vasodilation) is known as A. margination B. Diapedesis C. Hyperemia D. co-stimulation Which interferon is secreted by lymphocytes and causes immune mobilization such as activating macrophages? B, IFN beta C. gamma (y) D. IFN delta (6) A. IFN alpha (a) (B) IFN 44. Perforins and molecules are released by what cells as part of their mechanism of action? helper T cells B. cytotoxic T cells C. regulatory T cells D. B cells Which type of helper T cell defends against parasitic worms, promotes allergies and B cell activation? A. TH2 cells B. TH1 cells C. TH17 cells D. TH5 cells T cell activation requires all of the following steps EXCEPT: A. Antigen presentation by APCs on MHC proteins B. Co-stimulation protein to the antigen-MHC complex C. Binding of T cell receptor and the CD4/CD8 D. Binding to B cells that act on exposed to something foreign and temperature resulting in a fever thermostat) to raise the body antibodies neurons pyrogens C. regulatory proteins

Explanation / Answer

34. Maturation of T lymphocytes takes place in the thymus.

35 b) Diapedesis-Diapedesis is the capability of white blood cells to squeeze between the cells of blood vessel walls.

36 a) Vaccines.

37 c) IgG- Almost makes upt o 80 % of all antibodies produced.

38 b) Cytotoxic T cells (Cytokines made by T helper 1 cells activates CD8 cells, causing production of cytotoxic T cell)

39. d) Defensins.-Defensins- antimicrobial peptides work mainly by destroying bacterial cell membranes, and are also active against certain fungi.

40. b) Plasma cells make antibodies(Antibodies are secreted by the plasma cells, derived from the B cells).

41. a) Numbness

42. c) Hyperaemia.

43. c) IFN gamma

44. b) Cytotoxic T cells( also natural killer cells also produce perforins).

45. a) TH2 Cells (Th2 cells are the immunity effectors against parasites. Th2 also results in IgE-mediated allergy reaction).

46. d) B inding to B cells.

47. b) Pyrogens (A protein produced by leukocytes in response to the exogenous pyrogens which are released into circulation and which induces fever by acting on the hypothalamus)

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