Which organs and tissues control the two types of specific immune functions?
a. The spleen and mucous membranes
b. Upper and lower intestinal lymphoid tissue
c. The skin and lymph nodes
d. The thymus and bone marrow
D
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A Both the spleen and mucous membranes are secondary organs of the immune
system that act as filters to remove debris and antigens and foster contact with T
lymphocytes.
B Gut-associated lymphoid tissue is a secondary organ of the immune system. This
tissue filters antigens entering the gastrointestinal tract.
C The skin and lymph nodes are secondary organs of the immune system.
D The thymus controls cell-mediated immunity (cells that mature into T
lymphocytes). The bone marrow controls humoral immunity (stem cells for B
lymphocytes).
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