The five major immunoglobulin classes are designated IgA, IgD, IgE, IgG, and IgM, on the basis of the C regions in their heavy chains. The antibodies of each class have different biological roles and locations in the body. IgA - IgA monomer exists in limited amounts in plasma. The IgA dimer, also called secretory IgA, is found in body secretions such as saliva, sweat, intestinal juice, and milk, and helps prevent attachment of pathogens to …showed first 75 words of 829 total…

…showed last 75 words of 829 total…a result, immunological memory does not occur and the protection provided by the borrowed antibodies ends when they naturally degrade in the body. Passive immunity is artificially conferred via a serum, which is called gamma globulin, which is administered after exposure to hepatitis. Other immune serums are used to treat snakebites, botulism, and tetanus. The donated antibodies provide immediate protection, but their effect is short-lived - two to three weeks. <Tab/>