A) IgE
B) IgG
C) IgA
D) IgM
Correct Answer: A
Solution :
Hypersensitivity (allergy) refers to an antigenic response beyond that considered normal. Antibodies or immunoglobulms are proteins that are made in response to antigen and can recognise and bind to that antigen. The common inmunoglobulins are- [a] IgE constitute about 002% of the total serum antibodies. IgE molecules bind tightly by their \[{{F}_{c}}\] end to receptor on mast cells and basophils, which are specialized cells tha.t participate in allergic reactions. [b] IgG constitute about 80% of all antibodies in serum. These protect against circulating bacteria and viruses enhance the effectiveness of phagocytic cells. [c] IgM makeup 5-10% of the antibodies in serum. These involved in the response to ABO blood group antigens on the surface of red blood corpuscles. [d] IgA account for only about 10-15% of antibodies in serum. Main function of IgA is probably to prevent the attachment of pathogens particularly viruses and bacteria to mucosat surface.
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