Question

Briefly outline the layers of immune defence and illustrate how they may interact

Answer 1

Immune system destroys the foreign organisms and maintain normal health status of a human body.

There are three lines of immunse defense system-

Physical and chemical barriers

Nonspecific defence system

Specific defence system

Physical and chemical barriers constitute the first line of defence and include- skin, mucous membrane, saliva, gastric acid, hairs, sebum etc.

Nonspecific defence system constitute second line of defence and involves phagocytic cells and inflammatory mediators.

Physical barriers, chemical barriers and nonspecific defense system comes under innate immunity.

Specific defense system comes under acquired immunity and constitute third line of defence. it consists of antigen antibody reactions, T cell mediated pathway, which acts against specific foreign substances found in the body.