Explain Antibodies

Antibodies (also referred to as immunoglobulins and garnmaglobulins) are produced by plasma cells. They are Y-shaped proteins that each respond to a specific antigen. What is an antigen? The  foreign matter  (bacteria,  virus  or toxin)  that enters  the  body and elicits a  specific  immune  response  by  lymphocytes is  called an  antigen  or  immunogen. It stimulates the immune system to produce protective chemicals or special cells to destroy the antigens.  These protective chemicals are called antibodies.