Question

Which of the following immune cells is involved in fighting viral infections, but not typically used in fighting bacterial infections?

1. natural killer cells             B)T cytotoxic cells                  C) B cells                   D) Macrophages
   
   Lymphocytes are

A) The two main types of lymphocytes are T cells and macrophages.

B) B cells, T cells, and natural killer cells are derived from lymphocytes.

C) T cells are the precursors of B cells.

D) T cells are the only form of lymphocyte found in lymphoid tissue.

Answer 1

• Natural killer cells are involved in fighting viral infections ,but not typically used in fighting bacterial infections.
• Natural killer cells are the first line of defence in specific immunity particularly against the viruses .
• Natural killer cells have granules which contain hydrolytic enzymes.The hydrolytic enzymes play an important role in the lysis of cells of invading organisms.
• T cells , B cells and macrophages are active against the bacterial infections.
• Lymphocytes are - B cells , T cells and natural killer cells are derived from the lymphocytes.The processing of the B lymphocyte takes places in the bone marrow , T lymphocyte in the thymus and natural killer cells process into the bone marrow and lymph nodes .