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Appears in serum and tissues
Assumes major role in bloodborne and tissue infections
Activates complement
Enhances phagocytosis
Crosses placenta


Appears in body fluids
Protect against respiratory, GI, and genitourinary infections
Prevents absorption of antigens from food
Passes through breast milk


Appears mostly in intravascular serum
Appears as first immunglobulin produced in response to bacterial and viral infections
Activates complement


Appears in small ammounts in serum
Possibly influences B-lymphocyte differentiation


Appears in serum
Takes part in allergic and some hypersensitivity reactions
Combats parasitic infections

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