What immunoglobulin (Ig) is present in small amounts and is thought to be related to allergic responses?
A) IgM
B) IgG
C) IgE
D) IgA
C
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Five different types of immunoglobulins have been identified: 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 immunoglobulin found in the serum is IgG. 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. These antibodies react with specific pathogens that are encountered in exposed areas of the body.
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