Antibody Classes

Question 1

IgA

Answer 1

Found in mucous, saliva, tears, and breast milk

Protects against pathogens

Question 2

IgD

Answer 2

Part of the B cell receptor

Activates basophils and mast cells

Question 3

IgE

Answer 3

Protects against parasitic worms

Responsible for allergic reactions

Question 4

IgG

Answer 4

Secreted by plasma cells in the blood

Able to cross the placenta into the fetus

Question 5

IgM

Answer 5

May be attached to the surface of a B cells or secreted into the blood

Responsible for early stages of immunity