4.1.1g) The primary and secondary immune responses

Question 1

Primary response

Answer 1

Pathogen enters body for the first time
Antigens on the pathogen on its surface activate the immune surface
Slow response due to not many B that can make the antibody needed to bind to the pathogen
Eventually the body will produce enough of the right antibody to fight off the infection
Infected person may show symptoms
After being exposed to the antigen, T&B cells produce memory cells
Person is now immune - immune system can respond quickly to a second infection

Question 2

Memory T Lymphocytes

Answer 2

Remember specific antigen & will recognise in 2nd time around

Question 3

Memory B lymphocytes

Answer 3

Record specific antibodies needed to bind to the antigen

Question 4

Secondary response

Answer 4

The same pathogen enters the body - immune system will produce a quicker, stronger immune response
Clonal expansion happens faster
Memory B cells - divide into plasms cells that produce the right antibody to the antigen
Memory T cells - activated & divide to the correct type of T cells to kill the cell carrying the antigen
Often gets rid of the pathogen before showing symptoms