The immune system is a group of cells, molecules, and tissues that help patronage the body against diseases and other harmful busyrs. The immune system provides resistance against a variety of potentially damaging substances that can invade the body. These substances include disease-causing organisms, such as bacteria, fungi, parasites, and viruses.
The first line of self-renunciation against extraneous encroachers is innate immunity. Innate immunity encompasses skin, and the respiratory system, which as well as contains mucus that traps and destroys encroachers. This type of Immunity destroys any foreign invader forwards the onset of symptoms. When any invader gets passed the skin a person must use their acquired immunity, to help fight slay the invader. This immunity either comes from having been attack by the invader before and already having antibodies, or it comes from receiving antibodies, i.e. a vaccine. If a certain invader has not attacked the body before the immune rejoinder is kicked in to full gear to help fight it off.
All foreign invaders fuddle certain markers on them known as antigens. The antigens are what ordinate the body that in is in fact a foreign invader. If a person already has the antibodies for a certain antigen so the invader will be neutralized instantly, and then eaten by a macrophage. As said if the antigen is new then a long process goes in to affect.
There are 2 different responses, the Cellular response and the Humoral response.
The Humoral response starts when a macrophage sees and engulfs the invader. The macrophage then displays the antigens of the invader on itself. It then starts the helper T-cells. The helper T-cells recognize what the antigen(s) look like. The Helper T-cells then activate the B-cells. Also the Helper T-cells activate the Killer T-cells as go bad of the Cellular response. The B-cells also...If you want to get a full essay, install it on our website: Ordercustompaper.com
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