Lymphatic System Questions and Correct Answers

The function(s) of lymph nodes include - - filter lymph - immune surveillance - filter blood Cell membrane proteins called ___________ major histocompatibility complex (MHC) antigens are found on antigen-presenting cells, thymus cells, and activated T cells - Class II The _____________ MHC antigens are found on membranes of all body cells, except red blood cells. - Class I Absence or blockage of lymph vessels in a body region leads directly to: - edema Fill in the blanks in the figure legend, indicating the identity of the different colored segments of the antibody molecule. - The lymph nodes of the axillary region receive lymph mainly from the - upper limb and mammary gland. Characteristics of IgA: - - in exocrine gland secretions - 13% of circulating antibodies - defends against bacteria and viruses - in breast milk, tears, nasal fluid, gastric juice, and urine. Characteristics of IgG: - - crosses placenta - in plasma and tissue fluid - 80% of circulating antibodies - activates complement proteins - defends against bacteria, viruses, & toxins Characteristics of IgE: - - in exocrine gland secretions - promotes inflammation & allergic reactions Characteristics of IgM: - - Activates complement proteins - in plasma only - 6% of circulating antibodies - causes agglutination in transfusion reactions Characteristics of IgD: - - on the surface of most B Lymphocytes - functions in B Cell activation Memory T and B cells function in: - secondary immune responses Antimicrobial substances; bind to sugar groups on pathogen; enhance phagocytosis - collectins Antimicrobial substances that put holes in pathogen cell membranes - Defensins Group of proteins that, when activated, stimulate inflammation and phagocytosis - Complement Released by virally-infected cells; protects nearby uninfected cells - Interferons Which of the following are cytokines? - Colony stimulating factors, interferons, interleukins, tumor necrosis factor