Which one is not a component of third line of body defence?
A
Killer T-cells
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B
Natural killer cells
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C
Memory cells
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D
Plasma cells
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Solution
The correct option is B Natural killer cells The third line body defense or adaptive immune system consists of cells that show specific resistance. The lymphocytes like B-Cells (Antibodies, Plasma Cells and the Memory cells) and T-Cells which show specificity towards a particular antigen are a part of third line of defense. However, the natural killer cells shows no such specificity towards an particular antigen and are a
component of innate immune system.