which system fights off disease?
A healthy and responsive immune system fights the disease causing pathogens and micro organisms with the help of special cells and tissues. Immune system is made up of a system of cells and organs. Its primary function is to build resistance in the body and fight off diseases and infections. It detects the various disease causing agents and protects the body against their attack. The bone marrow, spleen, lymph nodes and thymus are some important organs of the immune system.