5.4 B Lymphocytes And Humoral Immunity

Question 1

B lymphocytes?

Answer 1

• mature in bone marrow
• associated with humoral immunity

Question 2

What do plasma cells do?

Answer 2

Secrete antibodies

Question 3

What is the production of antibodies and memory cells called?

Answer 3

Primary immune response

Question 4

What are memory cells?

Answer 4

Cells that when it encounters an antigen at a later date, they divide rapidly into plasma cells to secrete the complementary antibodies to destroy the pathogen.

Question 5

Which response are memory cells responsible for?

Answer 5

Secondary immune response

Question 6

What is the role of B cells in humoral immunity?

Answer 6

1) surface antigens from pathogen are taken up by a B cell
2) process the antigens and present them on surface
3) Helper T cells attach and activate the B cells
4) the plasma cells divide rapidly by mitosis and secrete the specific antibody, destroys pathogen
5) some B cells develop into memory cells

Question 7

An antigen in a vaccine leads to the production of antibodies. Describe the part played by B lymphocytes in this process.

Answer 7

1) macrophage engulfs pathogen and presents antigen
2) antigen binds to complementary receptor
3) binds to a specific lymphocyte
4) cloned and reproduced by mitosis
5) plasma cells now secrete antibodies