ICT (Information Communications Technology) is a term widely used in the context of education. Even though there is no universally accepted definition for ICT, it mainly refers to utilizing digital technologies such as computers, television, email, etc to help individuals or organizations to use information.
Type IV (called also delayed hypersensitivity) involves sensitized T lymphocytes that react with cell bound or associated antigen and release lymphokines, causing mononuclear cell accumulation, tissue damage and inflammation, typically manifesting at least 24 hours after exposure to the antigen.
Description: Not an antibody-mediated response; Two types: 1. Cell-mediated hypersensitivity with cytotoxic T cell involvement (CD8 cells are activated by foreign Ag/MHC 2. Class I complex in virus-infected or tumor cells).rocessed antigen is presented at the T cell receptor site by an antigen presenting cell (APC) bound to a MHC class II molecule; The CD4 protein on the T helper cell binds to a portion of the MHC molecule which provides a signal for T cell activation.