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Our immune system gives us protection from infectious diseases. Immunity is a state of protection from harmful bacteria, viruses, parasites etc. The immune system is spread throughout the body and involves many types of cells, organs, proteins, and tissues.
It helps to distinguish our own tissue from foreign tissues. Immune system recognizes dead and unnecessary cells and cleared them out. If our immune system encounters a pathogen ( a bacterium, virus, or parasite), it mounts an immune response.
The immune system is made up of two parts: the innate, (general) immune system and the adaptive (specialized) immune system. These two systems work closely together and take on different tasks. Innate and adaptive immunity Innate immunity is the first line of defense against infection.
Innate immunity acts very quickly. Phagocytic cells such as macrophages, neutrophils, barriers such as skin and a variety of antimicrobial compounds synthesized by the host all play significant roles in innate immunity. The closed surface of the skin and of all mucous membranes already forms a physical barrier against germs, which protects them from entering.
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