The lymphatic system and immunity - Antibody-mediated immunity

4 important questions on The lymphatic system and immunity - Antibody-mediated immunity

What immunoglobulin enhances phagocytosis, neutralises toxins and activates the complement system?

IgG

What immunoglobulin is the only class of antibody that is able to cross the placental barrier?

IgG

What immunoglobulin is secreted by plasma cells after initial antigen exposure?

IgM
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What immunoglobulin binds to ABO antigens and activates complement system?

IgM

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