More Information: Antibodies (also known as immunoglobulins, abbreviated Ig) are gamma globulin proteins that are found in blood or other bodily fluids of vertebrates, and are used by the immune system to identify and neutralize foreign objects, such as bacteria and viruses.he main non-specific defenses consist of: Lysozymes-such as teardrops which attack bacterial cell walls causing the cell to burst or lyse. Ciliated Epithelia-which are hairlike fibers that can catch pathogens and dispose of them.