exam q antibody, antigen etc

Question 1

Describe how a vaccine triggers an immune response.

Answer 1

• vaccine contains a weak pathogen
• immense system recognises the foreign pathogen
• causes the stimulation of b lymphocytes secreting antidodies
  -formation of memory cells from b cells and t cells .

Question 1

Why does immunity to a pathogen often last for a long time after infection?

Answer 1

• memory b cells - rapid produce antibodies
  -memory T cells - quicker and efficient response
  3) memory cells live for years.

Question 2

Describe how the body recognises and causes an immune respons to an infection

Answer 2

-A pathogen enteres the body through infection
Pathogen able to pass through physical and chemical barriers (skin)
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Phagocytosis occurs causing pathogen to be destroyed
Pathogen is then presented
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This causes t helper cells to be stumulationed and when they copied, b helper cells are stimulated

Agglutination
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Memory cells