Your immune system works to root out germs and other invaders that have no business in your body. How it helps guard your body from all threats:
This network of tissues, cells, and organs first tries to keep out germs like bacteria, viruses, fungi, and parasites and then deals with them if they manage to get in. If it senses something in your body that could be bad for you, it triggers the release of special cells. These travel to where the trouble is, attack the intruder, and help get rid of it.Your body has to be able to stop invaders that come from a lot different places.
Basophils are in your blood; mast cells are in tissues. When these cells find certain antigens , they release histamine to bring immune cells to the area. Your body sends more blood there, causing inflammation -- redness, warmth, and swelling -- that also helps keeps the invasion from spreading.These infection-fighting white blood cells are the reason you get sick from things like chicken pox only once. Lymphocytes called T cells and B cells work together to build your acquired immunity.
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