1. Match the following leukocytes (A-L) with the correct description (a-j). Each term should be used only once or it should not be used at all. (c) (d) (e) (f) A. Mast cells B. Neutrophils C. Macrophages D. Eosinophils E. Monocytes F. Dendritic cells G. B cells H. Helper T cells I. Cytotoxic T cells J. Basophils K. Plasma cells L. Natural killer cells can perform phagocytosis and they are the most abundant type of leukocytes in the blood. are found in various tissues and release histamine and other chemicals involved in inflammation. are cytotoxic cells used for the killing of parasites are transformed into macrophages when they enter tissues. are antibody-producing cells. belong to the specific immune system and can kill virus-infected cells and cancer cells. have receptors consisting of two heavy chains and two light chains can kill pathogens by phagocytosis and present peptide antigen fragments on MHC molecules. are found in the blood and are involved in allergic reactions. are antigen-presenting cells with long cytoplasmic arms. 3

The lymphatic tissues/organs illustrated below contain which of the following types of cells? 1.  reticular cells 2.  macrophages 3.  B lymphocytes 4.  T lymphocytes Choose from the following: (A) 1, 2 and 3 (B) 1, 2, and 4 (C) 2, 3, and 4 (D) 1, 3, and 4 (E) 1, 2, 3, and 4

7. Macrophages recognize target cells using which of the following? A. MHC class I molecules B. Toll-like receptors C. MHC Class II molecules D. Killer cell inhibitory receptors 8. The defense mechanism carried out by NK çells involves: A. recognition of a specific antigen. B. MHC class II-mediated killing. C. perforin- and granzyme-mediated killing D. phagocytosis. 9. All of the following are considered acute-phase reactants EXCEPT: A. fibrinogen. B. complement. C. C-reactive protein. D D. TNF-alpha