Tetanus is a bacterial disease that may be acquired during accidents in which a wound is exposed to the soil.

B-lymphocytes originate from stem cells, mature and circulate around the body. Following infection by tetanus bacteria, some B-lymphocytes will become activated as shown in the figure.

a. With reference to the figure, name:

i. The place where the stem cells divide to form B-lymphocytes

ii. The type of division that occurs at E

iii. The activated B-lymphocyte, F

iv. The molecule G.

b. Use the information in the figure to explain the differences between the following pairs of terms:

i. Antigen and antibody

ii. Self and non-self.

c. Explain how cell H is responsible for long-term immunity to tetanus.

Transcribed Image Text:

G mature B-lymphocyte stem cell tetanus bacteria enter the body H.