The immune system is our body’s personal cavalry, navy, and air force system. The highly advanced piece of technology that is the human body comes with its own in-built defense mechanism. Without the immune system, we would have no protection against harmful substances from the environment, diseases, and harmful cells.
Immunity is of 2 types, active and passive immunity. When our own immune system protects us from a pathogen, this is called active immunity. When we gain protection against a pathogen from someone else, this is passive immunity. The immune system contains white blood cells, antibodies, the lymphatic system, the spleen, the thymus, and the bone marrow.