immunology

Question 1

what is an antigen

Answer 1

any substance thats recognised as non-self

Question 2

key features of a specific response

Answer 2

1. slow
2. specific
3. memory

Question 3

3 jobs of a T cell

Answer 3

• trigger phagocytosis by releasing cytokines
• trigger B cells by releasing cytokines
• cytotoxic T cells can kill cells

Question 4

cell mediated immunity

Answer 4

the immune response to your own cells that are presenting antigens that are non self.

Question 5

what sort of cells are T cells responding to

Answer 5

phagocytes that have become APC
cancer cells
cells that are infected with viruses
transplant

Question 6

what is the cell mediated response

Answer 6

1. clonal selection in the Thymus
2. T cell binds to the antigen that on the MHC.
3. T cell duplicates (clonal expansion)
4. T helper cells will release cytokines
   the cytokines either trigger cytotoxic tcells, phagocytes or B cells.

Question 7

B cells

Answer 7

B cells can act as antigen presenting cells although rare.
presents that antigen to the T cell
t helper cell clonal expansion
release lots of cytokines
B cell divides and either becomes plasma cells or memory cells