PATHOLOGY

Detailed explanation-1: -Dendritic cells, macrophages, and B cells are often known as professional antigen-presenting cells. Effector T cells, as we learned in Chapter 5, fall into three functional classes that detect peptide antigens derived from different types of pathogen.

Detailed explanation-2: -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-3: -T cell, also called T lymphocyte, type of leukocyte (white blood cell) that is an essential part of the immune system. T cells are one of two primary types of lymphocytes-B cells being the second type-that determine the specificity of immune response to antigens (foreign substances) in the body.