Cell mediated immunity

Question 1

how is the production of t cells stimulated?

Answer 1

-its stimulated by the bodies own cells that have been changed due to the presence of non self material

Question 2

what is the name given to body cells that have been changed due to the presence of non self material?

Answer 2

-antigen presenting cells

Question 3

what are 3 examples of antigen presenting cells?

Answer 3

-phagocytes that have engulfed a pathogen and have some of its antigens on its membrane
-any type of body cell that has been infected by a virus because some of the antigens will be on its membrane
-cancer cells as they too have antigens on their surface

Question 4

can viruses live on their own?

Answer 4

-no they need a host cell

Question 5

what is the process of the production of a range of t cells in cell mediated immunity?

Answer 5

-antigen presenting cell is detected by t lymphocyte
-receptor of specific t lymphocyte is a complementary fit into the viral antigen on the cell surface membrane of the infected antigen presenting cell
-sensitised t lymphocyte divides rapidly by mitosis to form a clone
-the clone then develops into killer t cells, helper t cells, suppressor t cells and memory t cells

Question 6

what is the job of killer t cells?

Answer 6

-destroy infected cells by attaching to the antigens on the membrane on these infected cells byt destroying them by direct enzyme action