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Why do we fall ill, What is the Immune System?, , The immune system is a network of cells, tissues and organs, that work together in order to protect our body from diseases., We may consider the immune system as a defence system of, our body., , The immune system looks out and destroys the diseasecausing germs in our body with the help of special cells called, white blood cells. These cells are present in the blood and, hence circulate throughout the body and monitor it., , The germs or any foreign substance that enter our body are, called Antigens. As the immune system recognizes these, antigens, it releases antibodies which lock the antigens and, then destroy them with the help of other cells., , The ability of a body to resist a disease with the help of, antibodies is called Immunity.