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What area is antigen challenge and clonal selection most likely to occur?
Antigen challenge and clonal selection are most likely to occur in the secondary lymphoid organs, such as the lymph nodes and spleen. These organs are where antigens encounter immune cells, triggering an immune response and the selection of specific immune cell clones.
What nonlymphocyte cell is a central actor in clonal selection?
Antigen-presenting cells (APCs) are nonlymphocyte cells that play a central role in clonal selection. They present antigens to T cells, triggering the immune response and selection of specific clones of T cells that can recognize and respond to the antigen.
How does the activation of B cells occur in the immune response?
B cells are activated in the immune response when they encounter a specific antigen that matches their receptors. This triggers the B cells to multiply and differentiate into plasma cells, which produce antibodies to target and neutralize the antigen.
What is clonal selection responsible for?
Clonal selection is responsible for the production of a large population of identical B or T cells that specifically recognize and target a particular antigen. This process is critical for the adaptive immune system's ability to mount a targeted immune response against pathogens.
Alloreactivity is a positive selection step or negative selection step?
Neither. Alloreactivity has to do with a lymphocytes reacting to a foreign antigen. Positive and negative selection are processes of central tolerance which is to say that they deal with a T cell's ability to bind self-antigen.
The binding of an antigen to an antibody can result in?
neutralization of the antigen, agglutination or precipitation, and complement activation.
What do dendrictic cell do?
antigen processing and presentation
Is T cell activation antigen specific?
Yes. The first signal that a T cell receives from an antigen presenting cell (dendritic cell) is MHC presenting an antigen (foreign peptide). This gives the T cell specificity to this antigen.
What happens when a B cell recognize an antigen?
When a B cell recognizes an antigen, it will undergo activation and differentiation into plasma cells, which produce antibodies specific to that antigen. Some B cells may also differentiate into memory cells that provide long-lasting immunity to the antigen. This process is essential in the adaptive immune response to eliminate pathogens and prevent future infections.
What area is antigen challenge and clonal selection most likely to occur?
Antigen challenge and clonal selection are most likely to occur in the secondary lymphoid organs, such as the lymph nodes and spleen. These organs are where antigens encounter immune cells, triggering an immune response and the selection of specific immune cell clones.
How do cells involved in the humoral response respond to antigen presentation on the surface of a B cell?
Helper T cells recognize the receptor-antigen complex and cause plasma and memory cells to be produced to then produce antibodies.
What does the body do when an antigen enters the body?
when a antigen enters the body then the body would send antibodies to get rid of them. The antibody doesn't get rid of the antigen they tag it by binding to it so that a cell..a white blood cell can come and destroy by phagi.
What nonlymphocyte cell is a central actor in clonal selection?
Antigen-presenting cells (APCs) are nonlymphocyte cells that play a central role in clonal selection. They present antigens to T cells, triggering the immune response and selection of specific clones of T cells that can recognize and respond to the antigen.
Is CD4 an adhesion molecule?
The glycoprotein CD4 is a co-receptor. A co-receptor is "a cell surface receptor, which, when bound to its respective ligand, modulates antigen receptor binding or affects cellular activation after antigen-receptor interactions." (MediLexicon)
When IL-2 is secreted by antigen-specific T cells activated due to presentation of antigen by APCs What happens to naive antigen-nonspecific T cells in the vicinity?
Naive antigen-nonspecific T cells do not become activated since they lack the T cell receptor specificity for the particular antigen being presented. They do not respond to IL-2 secreted by the activated antigen-specific T cells and remain in a resting state until they encounter an antigen to which they are specific.
How does the activation of B cells occur in the immune response?
B cells are activated in the immune response when they encounter a specific antigen that matches their receptors. This triggers the B cells to multiply and differentiate into plasma cells, which produce antibodies to target and neutralize the antigen.
What is the single most important event in establishing a primary immune response?
The recognition of an antigen by a naive T or B cell is the most important event in establishing a primary immune response. This recognition leads to activation and proliferation of these cells, resulting in the generation of specific immune responses to combat the antigen.
