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Antibodies are proteins produced by the immune system in response to foreign substances such as bacteria, viruses, and toxins. There are five main types of antibodies: IgA, IgD, IgE, IgG, and IgM. IgA is found in the mucous membranes of the respiratory and gastrointestinal tracts, and it is the most abundant antibody in the body. IgD is found on the surface of B cells and helps to activate them. IgE is found in the lungs, skin, and mucous membranes and is involved in allergic reactions. IgG is the most common antibody and is found in all body fluids. IgM is the largest antibody and is the first to respond to a new infection.
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Lymphatic system
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