89. How do the re a. Only white b b ood cellsy a role in the body\'s defense aga

Question

89. How do the re a. Only white b b ood cellsy a role in the body's defense against infection. comparison between these two types of cells; reticuloendothelial cells cells (macrophages) lining the spleen remove microorganisms oendothelial cells (macrophages) lining the spleen prevent microorganisms Only white blooddothelial el compare to white blood cells as a defense against atic system and the white blood cells are part of the circulatory system. from the blood white blood cells. and destroy them by phagocytosis in a fashion similar to that of destroy d. Reticul trom entering the blood in a similar fashion as do white blood cells, thus preventing infection. 90. A person with thymus malfunction would produce fewer B cells, thus reducing the effectiveness of the immune system. b. a. experience an inhibition of thymosin, thus creating an increased number of macrophages in the body c. produce more T cells, thus reducing the effectiveness of the immune system. d. produce fewer T cells, thus reducing the effectiveness of the immune system. Which best describes the mechanism involved with the central movement, or flow, of lymph? 91. a. Movement is caused by gravity b. Lymph flow is caused by relaxation of the skeletal muscles. Lymph flow in the body is the result of contracting skeletal muscles. d. c. Lymph flow is caused by the contraction of blood vessels. 92. Memory cells: immediately secrete antibodies when they are formed. a. b. are supporting cells and are not related to antibody production. c. are a special type of T cell. d. become plasma cells when exposed to an antigen. The antibody produced after initial contact with an antigen is: a. IgE b. IgG c. IgM d. IgA. 93. The antibody commonly found in tears and saliva is a. IgE. b. IgD c. IgM d. IgA. 94.

Explanation / Answer

89.c.

Reticloendothelial cells (macrophages) lining the spleen remove microorganisms from the blood and destroys them by phagocytosis in a fashion simular to that of white blood cells.

90.d.Produce fewer T cells thus reducing the effectiveness of the imune system.

91 c .lymph flow in the body is the result of contracting skeletal muscles.

92.d.become plasma cells when exposed to an antigen.

93.c.the antibody produced after initial contact with an antigen is IgM

94 .IgA

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