Our bodies contain various immunoglobulins (Ig). Which of these immunoglobulins is found in sweat, tears, mucus, and bile?
A) IgG
B) IgA
C) IgM
D) IgE
B
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Five different types of immunoglobulins have been identified: IgA is found in tears, saliva, sweat, mucus, and bile. It is secreted by plasma cells in the GI and respiratory tracts and in epithelial cells. IgE is present in small amounts and seems to be related to allergic responses and to the activation of mast cells. The first immunoglobulin released is M (IgM); it contains the antibodies produced at the first exposure to the antigen. IgG, another form of immunoglobulin, contains antibodies made by the memory cells that circulate and enter the tissue; most of the immunoglobulin found in the serum is IgG. These antibodies react with specific pathogens that are encountered in exposed areas of the body.
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