Innate immunity consists of four types of barriers. Among the cells that constitute the cellular barriers, which of the following is specifically categorized as a type of lymphocyte?

Step-by-step solution

Innate immunity provides non-specific defense through various barriers. The cellular barriers include certain types of leukocytes (WBCs) such as polymorpho-nuclear leukocytes (PMNL-neutrophils), monocytes, and natural killer cells in the blood, as well as macrophages in tissues. According to NCERT, natural killer cells are specifically a type of lymphocyte that act as a cellular barrier in innate immunity. PMNLs and monocytes are other types of leukocytes, while macrophages are tissue phagocytes. Answer: Natural ki