What is the antigen challenge and where does it occur?
The antigen challenge is the first encounter between an immunocompetent lymphocyte and an invading antigen. It usually takes place in the spleen or a lymph node, but may happen in any lymphoid tissue. They are vital in the final stopping of an immune response after the antigen is inactivated.
What is an antigen defined as?
(AN-tih-jen) Any substance that causes the body to make an immune response against that substance. Antigens include toxins, chemicals, bacteria, viruses, or other substances that come from outside the body.
Why is antigen important in fighting infection?
An antigen-presenting cell (APC) is an immune cell that detects, engulfs, and informs the adaptive immune response about an infection. When a pathogen is detected, these APCs will phagocytose the pathogen and digest it to form many different fragments of the antigen.
What is an antigen in blood?
An antigen is any substance to which the immune system can respond. Conversely, antigens that are found on the body’s own cells are known as “self-antigens”, and the immune system does not normally attack these. The membrane of each red blood cell contains millions of antigens that are ignored by the immune system.
Which substance is responsible for determining which cells will eventually become cloned?
THE IMMUNE SYSTEM
|THE REDNESS AND HEAT OF AN INFLAMED AREA ARE DUE TO A LOCAL HYPEREMIA CAUSED BY
|THE ANTIBODY MOELECULE IS HELD TOGETHER BY______ BONDS
|IN CLONAL SELECTION OF B CELLS WHICH SUBSTANCE IS RESPONSIBLE FOR DETERMINING WHICH CELLS WILL EVENTUALLY BE CLONED
Is any substance capable of mobilizing our immune system and provoking an immune response?
– Antigen: any substance capable of mobilizing our immune system and provoking an immune response.
What is the best definition of antigen?
An antigen is any substance that causes your immune system to produce antibodies against it. This means your immune system does not recognize the substance, and is trying to fight it off. An antigen may be a substance from the environment, such as chemicals, bacteria, viruses, or pollen.
What is the role of antigen-presenting cells?
Antigen-presenting cells (APCs) are a heterogeneous group of immune cells that mediate the cellular immune response by processing and presenting antigens for recognition by certain lymphocytes such as T cells.
What are the qualities of most antigens?
Characteristics of a good antigen include: The ability to be processed by the immune system. Immunogenic regions that are accessible to the antibody-forming mechanism. Structural elements that are sufficiently different from the host.