The Role of Helper T cells

Question 1

Activated T-lymphocytes (those that have receptors specific to an antigen) divide by mitosis to increase in number (similar to the clonal selection and clonal expansion of B-lymphocytes)

These T-lymphocytes differentiate into two main types of T cell:

Answer 1

T helper cells

T killer cells

Question 2

Helper T cells assist other

Answer 2

white blood cells in the immune response

Question 3

Helper T cells assist other white blood cells in the immune response

They release ……………(hormone-like signals) which stimulate

Answer 3

cytokines

The maturation of B-lymphocytes into antibody-secreting plasma cells

The production of memory B cells

The activation of cytotoxic T cells, which destroy virus infected cells and tumour cells

An increased rate of phagocytosis

Question 4

T killer cells patrol the body for

Answer 4

in search of antigen-presenting body cells

Question 5

T killer cells attach to the

Answer 5

foreign antigens on the cell surface membranes of infected cells

Question 6

When T killer cells attach they secrete

Answer 6

secrete toxic substances that kill the infected body cells, along with the pathogen inside

Question 7

Perforins secreted by T killer cells

Answer 7

punch a hole in the cell surface membrane of infected cells, allowing toxins to enter