t helper cells
T helper cells
T helper Cells
helper T cell
Specific immunity is also known as adaptive immunity or acquired immunity active or passive. There are two types of specific immune responses; humoral and cell mediated. Humoral immunity is mediated by B Lymphocytes that produce antibodies; forms of B lymphocytes are IgG, IgM, IgA, IgE. They primarily attach bacterial invaders Cellular immunity is mediated by T Lymphocytes and combat intracellular infections (such as viruses), monitor cellular disruptions like tumors or foreign tissues, and fight fungal infections.
Helper T cells
B lymphocyteB cells.B-lymphocytes
humoral immunity
Humoral immunity is effected by antibodies produced by plasma cells toward a specific foreign antigen. Cellular immunity does not directly involve antibodies, but refers to cellular destruction of alien cells/tissues by production of cytotoxins locally, typically the latter are produced by T-lymphocytes and natural killer cells.
The cellular system is composed of many classes of T-lymphocytes (white blood cells that detect foreign invaders called antigens).
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Antibodies are produced by B lymphocytes as the third line of defense to provide humoral immunity.
ANTIBODY IMMUNITY IS BETTER TERMED AS HUMORAL IMMUNITY Humoral immunity is acquired by B-lymphocytes and T-helper lymphocytes as An antigen is engulfed by antigen processing cell (APC) e.g. , B-cells then a part of an antigen (epitope) is presented to T-helper cells in association with MHC-II (MAJOR HISTOCOMPATIBILITY COMPLEX) then T-helper cell activates B-cell to produce effector cell (plasma cell) and memory cell then plasma cell secrete antibodies which neglify harmful or toxic effects of the above antigen. CELL MEDIATED IMMUNITY Every cell of the body can show this response while in the above case only APC can show humoral response A whole foreign body/ antibody is engulfed by the cell then epitope is represented to cytotoxic T-lymphocytes(CTLs) then CTLs secrete certain chemicals which kill the cell along with foreign body.