question_answer

(i) Differentiate between B - lymphocytes and T - lymphocytes.

(ii) Give the name of an autoimmune disease.

Answer:

(i)
B - Lymphocytes	T - Lymphocytes
B - cells form humoral or Antibody - Mediated Immune System (AMIS).	T - cell form Cell - Mediated Immune System (CMIS).
They defend against viruses and bacteria that enter the blood and lymph.	They defend against pathogens including protists and fungi that enter the cells.
They form plasma cells and memory cells by the division.	They form killer, helper and suppressor cells by the division of lymphoblasts.
(ii) Rheumatoid arthritis is an autoimmune disease.