Question

Identify the organism that is responsible for the destruction of vital cells in the immune system.

Answer 1

Immune system is the system which protects the body against harmful pathogens. It comprises cells like WBC, lymphocytes, T cells, macrophages which are vital to the system. They secrete antibodies and are also phagocytic in nature which destroys foreign invasions.

Complete answer:
A disease is a state during which the immune system is challenged. The disease occurs when the immune system fails to protect the body. This failure occurs when the cells of the immune system are destroyed leading to non-production of antibodies. This could happen due to autoimmune disease and also if the person is infected by HIV.

HIV is the Human-immune virus which is responsible for causing AIDS. This virus attacks the specific cells of the body called the T cells and destroys it. These cells are important in bringing about an immune response. As these cells are no longer efficient for bringing about response, it is hard for the immune system to protect the body from other infections. Figure A shows the HIV virus which causes AIDS.

Figure B, Fig C. Fig D represents rod shaped bacteria called the Bacillus. Protozoa, Cocci. These cells are the foreign invaders which cause disease. These bacteria are detected by the macrophages. These cells destroy the bacteria by the phagocytic activity and thus protect the body.

Thus the correct answer is option ‘A’.

Note: The foreign pathogen produces antigen in our body to cause infection. The WBC in response to these antigens produces specific antibodies which neutralises the effect of the antigen or toxins thereby protecting the body from harmful invaders. The WBC or leukocytes are present in our blood. They consist of several cells like basophil, lymphocytes, neutrophil, monocytes etc.