What is an alternative term for immunoglobulin?

Immunoglobulin is a type of protein produced by plasma cells that play a critical role in the immune response. The primary function of immunoglobulins, commonly known as antibodies, is to identify and neutralize foreign objects like bacteria and viruses. When the body encounters an antigen (a term for any substance that induces an immune response), specifically tailored immunoglobulins are produced to bind to that antigen, marking it for destruction or neutralization.

The term "antibody" encapsulates the unique ability of immunoglobulins to recognize and interact with specific antigens. This specificity and capability to provide immunity is why immunoglobulins are often referred to as antibodies in clinical and laboratory settings.

Other options, such as enzymes, antigens, and pathogens, have distinctly different functions. Enzymes are catalysts that accelerate biochemical reactions but do not serve the protective or binding function of antibodies. Antigens are foreign substances that elicit the production of antibodies, while pathogens refer to disease-causing organisms such as bacteria or viruses. Hence, these do not represent alternative terms for immunoglobulin, reinforcing that "antibody" is indeed the correct alternative term.