ANATOMY
LYMPHATIC SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following is a nonspecific defense cell that produces a toxin (perforin) to kill foreign cells?
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interferons
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cytotoxic killer T cells
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phagocytes
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natural killer cells
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Explanation:
Detailed explanation-1: -The cytotoxic T cells are capable of recognizing antigens on the surface of infected body cells. The cytotoxic T cells bind to the infected cells and secrete cytotoxins that induce apoptosis (cell suicide) in the infected cell and perforins that cause perforations in the infected cells.
Detailed explanation-2: -Cytotoxic CD8 T cells carry out their killing function by releasing two types of preformed cytotoxic protein: the granzymes, which seem able to induce apoptosis in any type of target cell, and the pore-forming protein perforin, which punches holes in the target-cell membrane through which the granzymes can enter.
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