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प्रश्न
Briefly explain the role of the following in providing defence against infection in the human body:
T-cells
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उत्तर
T-cells are generated in the thymus and are programmed to be specific for one particular foreign particle (antigen). Once they leave the thymus, they circulate throughout the body until they recognize their antigen on the surface of antigen-presenting cells (APCs). The T-cell receptor (TCR) on both helper T-cells and cytotoxic T-cells binds to the antigen as it is held in a structure called the MHC complex, on the surface of the APC. This triggers the initial activation of the T-cells. T-cells themselves do not secret antibodies but help B cells to produce them.
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संबंधित प्रश्न
Briefly explain the role of the following in providing defence against infection in the human body:
B-cells
Observe the relation between the first two words and then fill in the fourth word.
Histamine: Mast cells :: Antibody: ______.
Which region of an antibody molecule determines its class and remains consistent within a type of antibody?
Disulphide bonds link the polypeptide chains of antibodies together. What type of additional stabilisation helps maintain antibody structure?
Which immunoglobulin comprises approximately 70% of serum antibodies and is capable of crossing the placenta?
Which heavy chain type is associated with IgA antibodies?
What is the process by which antibodies convert soluble antigens into insoluble complexes for removal from the body?
Which antibody function involves the activation of complement proteins that lead to the lysis of pathogens?
B-lymphocytes produce an army of proteins in response to pathogens. What is the collective name for these defensive proteins?
Which antibody class is the first to be produced during an immune response to pathogens?
