PATHOLOGY

Detailed explanation-1: -(D) Killer T-cells – They are a part of acquired immunity. They are involved in the body’s third line of defence. And, hence they are not a part of non-specific defence.

Detailed explanation-2: -Nonspecific defenses include anatomic barriers, inhibitors, phagocytosis, fever, inflammation, and IFN.

Detailed explanation-3: -Innate, or nonspecific, immunity is the defense system with which you were born. It protects you against all antigens. Innate immunity involves barriers that keep harmful materials from entering your body. These barriers form the first line of defense in the immune response.

Detailed explanation-4: -B cells are responsible for the production of antigen-specific antibodies while T cells serve in cell-mediated immunity. Fibrinogen is involved in blood clotting process. Phagocytes are the component of non-specific immune response and kill the pathogens that invade the body.

Detailed explanation-5: -The innate immune system is the body’s first line of defense against germs entering the body. It responds in the same way to all germs and foreign substances, which is why it is sometimes referred to as the “nonspecific” immune system.