What is a type of second-line defense in which lymphocytes act nonspecifically to kill cells that have been infected by certain viruses and cancer cells?

Question

Quizplus · Accepted Answer

Natural killer (NK) cells are a type of lymphocyte that acts nonspecifically to recognize and kill cells that have been infected by certain viruses or have become cancerous. B cells and T cells are types of lymphocytes, but they function differently in the immune system. Lymphokines are signaling molecules produced by lymphocytes, but they do not directly kill infected or cancerous cells.

What Is a Type of Second-Line Defense in Which Lymphocytes