OSMT (Ontario Society of Medical Technologists) Practice Exam

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Two antibodies involved in fixing complement are:

IgM, IgD
IgA, IgE
IgG, IgM
None of the above

The correct answer is: IgG, IgM

IgG and IgM are the correct antibodies involved in fixing complement. IgG is the most abundant antibody in circulation and is highly effective at fixing complement. IgM, on the other hand, is the first antibody produced in response to an infection and is also efficient in fixing complement. This combination of IgG and IgM working together helps in enhancing the immune response by facilitating the destruction of pathogens through complement activation.