antibodies (lymphatic system)

80 to 85% in serum
activates compliment and increases phagocytosis

can cross the placenta and provide protection to the
fetus
responsible for Rh reactions, such as hemolytic
disease of the newborn

15% in serum
secreted into saliva, into tears, and onto mucous membranes

protects body surfaces
found in colostrum and milk to provide immune protection to
the newborn

0.002% in serum
binds to mast cells and basophils and stimulates the
inflammatory response

5 to 10% in serum
activates compliment
acts as an antigen binding receptor on the surface of
B cells

responsible for transfusion reactions in the ABO
blood system

often the first antibody produced in response to an
antigen

0. 2% in serum

functions as an antigen-binding
receptor on B cells