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immune response

    Immune response is a complex and regulated sequence of events involving several cell types .Its trigger when an antigen enters the body and encounters a specialized class of cells called antigen presenting cells (APC) .The cells (APC) capture a minute amount of the antigen and display it in a form that can be recognized by ag –specific helper T cell . Th cells become activated and promote the activation of other classes of lymphocytes ,such as B cells or cytotoxic T cell .the activated lymphocyte then proliferate and carry out their specific effectors functions ,which in most cases successfully inactivate or eliminate the antigen .