IMMUNOLOGY

Detailed explanation-1: -The correct answer is (d) antibodies released by B lymphocytes.

Detailed explanation-2: -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-3: -(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-4: -there are two types: nonspecific, innate immunity and specific, acquired immunity. Innate immunity, with which an organism is born, involves protective factors, such as interferon, and cells, such as macrophages, granulocytes, and natural killer cells, and its action does not depend on prior exposure to a pathogen.

Detailed explanation-5: -Physical barriers, like skin and mucous membranes. Chemical deterrents, like antimicrobial enzymes in bodily fluids and stomach acid. Reflexes, like coughing and sneezing. Cells, like macrophages, basophils, and natural killer T-cells. 02-Feb-2022