5.3 T cells and cell mediated immunity

Question 1

cell- mediated immunity

Answer 1

• antigens attach to phagocyte
• T helper cell is complementary to phagocyte
• T cells divide by mitosis to produce T cell clones
• clones can:
  = become memory cells
  = stimulate B-cells to divide
  = stimulate phagocytosis
  = activate cytotoxic T cells

Question 2

what do cytotoxic T cells do?

Answer 2

• produce perforin that makes holes in cell- surface membrane
• cell membrane becomes freely permeable to all substances

Question 3

antigen definition

Answer 3

proteins that trigger an immune response

Question 4

what are cytotoxic T cells most effective against?

Answer 4

viruses because they replicate inside cells

Question 5

state 3 similarities between T cells and B cells

Answer 5

• both are types of white blood cells
• have a role in immunity
• are produced from stem cells

Question 6

state 2 difference between T cells and B cells

Answer 6

• T cells -> mature in thymus gland
• B cells -> mature in bone marrow
• T cells -> involved in cell- mediated immunity
• B cells-> involved in humoral immunity