21. The Immune System

The primary B-cell receptor is:

_______ is the immunoglobulin class that neutralizes viruses in the intestinal tract.

Which of the following is NOT an immunoglobin class?

Which antibody class crosses the placenta from mother to child?

______ is the first immunoglobulin class produced during a primary response.

Match the following antibody classes with their description:

a)   IgA.      b)  IgG.         c)  IgE.         d)  IgM.      e)  IgD.

___ First antibody produced during primary response.

___ Protects mucous membranes.

___ Most abundant antibody.

___ Found on the surface of B cells.

___ Triggers allergic reactions to allergens.