PATHOLOGY

Detailed explanation-1: -Killer T cells are called “cytotoxic” or “cytolytic” because they possess special molecular weapons that enable them to directly attack and destroy other cells displaying targets they recognize, for example, a virus-infected cell or even a cancerous cell.

Detailed explanation-2: -Killer T-cells find and destroy infected cells that have been turned into virus-making factories. To do this they need to tell the difference between the infected cells and healthy cells with the help of special molecules called antigens. Killer T-cells are able to find the cells with viruses and destroy them.

Detailed explanation-3: -The CD8 receptor interacts with cells called major histocompatibility complex (MHC) Class I molecules to recognize when healthy cells are infected. When the CD8 receptor recognizes an infected cell, it activates the cytotoxic T-cells. The cytotoxic T-cells create molecules designed to destroy the infection.

Detailed explanation-4: -Cytotoxic T-cells kill cells infected with viruses and bacteria, and they also destroy tumor cells. Helper T-cells: Helper T-cells are also called CD4+ cells because they have a CD4 receptor on their membranes. Unlike cytotoxic T-cells, helper T-cells don’t kill cells directly.