Immune System meaning

The immune system is the body's intricate defense mechanism against pathogens such as bacteria, viruses, fungi, and parasites, as well as against rogue cells that can develop into tumors. This complex network consists of specialized cells, tissues, and organs that work in concert to recognize and neutralize harmful invaders. Key components include white blood cells (leukocytes), antibodies, the complement system, lymphatic system, spleen, thymus, and bone marrow. When functioning correctly, the immune system can distinguish between self and non-self entities, mounting a response against foreign antigens while typically sparing the body's own cells. However, dysfunctions in the immune system can lead to autoimmune diseases, allergies, or immunodeficiency disorders.