IMMUNOLOGY

Detailed explanation-1: -The most important cells associated with innate immune responses are: Neutrophils-These are the most numerous type of innate immune responder cells. Their primary job is to destroy pathogens. Neutrophils circulate in the blood, but enter different parts of the body where an invader has been identified.

Detailed explanation-2: -T cells are part of the immune system and develop from stem cells in the bone marrow. They help protect the body from infection and may help fight cancer. Also called T lymphocyte and thymocyte.

Detailed explanation-3: -T cells can detect the presence of an intracellular pathogen because infected cells display on their surface peptide fragments derived from the pathogen’s proteins. These foreign peptides are delivered to the cell surface by specialized host-cell glycoproteins.

Detailed explanation-4: -Armed effector cytotoxic CD8 T cells are essential in host defense against pathogens that live in the cytosol, the commonest of which are viruses. These cytotoxic T cells can kill any cell harboring such pathogens by recognizing foreign peptides that are transported to the cell surface bound to MHC class I molecules.