Immune system consists of different types of cells and organs which protect our body against pathogens. Pathogens are defined as microorganisms that cause infections in the body such as bacteria, fungi, viruses and protozoans. Antigens are molecules that elicit antibody generation. They can be everything that does not belong to our body, from parasites to fungi, bacteria, viruses, and haptens. Haptens are molecules that can elicit an immune response when combined with a carrier molecule. All the cells and molecules of the immune system are distributed in all the tissues of the body as well as lymphoid organs which eliminate microbial infectious diseases, decrease the growth of tumours and starts the repairing process of damaged tissues.
The tissues and organs of the immune system act as security forces where cells act as the security guards while molecules act as the guns & bullets and use the communication system to protect you.
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