![]() ![]() Antibodies are molecules produced by the immune system to fight antigens.Īntibodies are created when B lymphocytes, or B cells, come into contact with an antigen. Once detected, antigens invoke an immune response that works to protect the body from antigen-induced damage.Ī central part of this immune response is the creation of antibodies. There are also autoantigens, or self-antigens, which are substances produced inside of the body that prompt an immune response. ![]() These external antigens are known as foreign antigens because they originate outside of the body. Antigens encompass pathogens or irritants that threaten the normal functioning of the body.Ĭommon antigens include microorganisms like viruses, fungi, and bacteria and toxins like pesticide residue and heavy metals. What are antibodies and antigens?Įvery day the human body is bombarded by hazardous substances and microorganisms. In this article, we will highlight what affinity and avidity are, how they function in the human body, the differences between the two and how they are exploited in scientific techniques. Because both affinity and avidity involve binding strength, the two terms are often confused. Affinity and avidity are two terms used in immunology and microbiology to describe binding strength between an antibody and antigen.
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