Explain autoimmune disease (biology)

N order for the immune system to protect the body against attack by foreign organisms, it must be able to distinguish between the body's own proteins (autoantigens) and proteins from foreign cells (foreign antigens ). When the immune system turns against autoantigens, thus attacking its own tissues, the resulting condition is an autoimmune disease.

answer: - b cells

explanation: -

there are many types of white blood cells present in our body. one such class of white blood cells are the lymphocytes. the b cells belong to the lymphocyte class of wbcs. the b cells perform their action against the pathogen by producing specialised proteins called as antibodies. these antibodies are produced as and when the b cells encounter pathogens in response to the antigens present on the surface of the pathogen. these antibodies bind to the antigens present on the pathogen and then, target them for destruction by other cells of the immune system.

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.