White blood cells (leucocytes) that are non-specific killers of microbes are
A
Phagocytes
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B
B-cells
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C
killer T-cells
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D
helper T-cells
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Solution
The correct option is B Phagocytes A- Monocytes are the largest of the white blood cells. Macrophages are monocytes that are present in nearly all tissue. They digest cells and pathogens by engulfing them in a process called phagocytosis.
B- B cells are a class of white blood cell known as a lymphocyte. B cells produce specialized proteins called antibodies to counter pathogens. Antibodies help to identify pathogens by binding to them and targeting them for destruction by other immune system cells.
C- Distinguish infected or cancerous cells from normal body cells and attack cells that are not identified as body cells.
D- Assist in the production of antibodies by B cells and help to activate cytotoxic T cells and macrophages.