The immune system is spread throughout the body and involves many types of cells organs proteins and tissues crucially it can distinguish our tissue from foreign tissue self from non self. The immune system can distinguish between normal healthy cells and unhealthy cells by recognizing a variety of danger cues called danger associated molecular patterns damps cells may be unhealthy because of infection or because of cellular damage caused by non infectious agents like sunburn or cancer. Immune system the complex group of defense responses found in humans and other advanced vertebrates that helps repel disease causing organisms pathogens immunity from disease is actually conferred by two cooperative defense systems called nonspecific innate immunity and specific acquired immunity
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