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The Immune System
Transcript of The Immune System
The Second Line The Third Line The First Lines' barriers consist of the skin, sweat and oil glands, saliva, tears, stomach acids, mucous membranes and enzymes. These barriers are called nonspecific defenses, meaning they cannot tell one invader from another.
The immune system is the bodily system which protects the body from diseases and keeps the body healthy.The immune system identifies and kills pathogens, which are basically germs. When the First line of defense is penetrated, by maybe an insect bite, the pathogens that enter your body are met by the second line of defense. The Internal Nonspecific Defense includes certain types of pathogen killing white blood cells. When the virus gets passed the first and second line, it meets the thrid line. The third line is a targeted defense, where the cells attack and destroy the virus cells. The Immune System
-Tyler Miller When a virus invades the body, and is recognized by the body, macrophage comes, absorbs the bacteria and kills is. The macrophage then displays a small piece of the virus on the outside, called an antigen, which provokes an immune responce. T Cells call for more help to destroy the virus. B Cells now 'tag' the virus so other cells know to destroy them. The K Cells then come and destroy the tagged germs. If the virus manages to spread to cells and infect them the Cytotoxic T cells comes to destroy the cell(s). Since there are so many cells in the human body killing a few is not a big deal. When there is a Virus, the macrophage engulfs the virus, breaks it down and displays a piece of the virus on the surface. The T Cell comes to alert other cells in the body there is a virus and to help kill it completely. From here there is the Cytotoxic T Cell which 'binds' onto the antigens on the infected cell and the Cytotoxic T Cell secretes Perforin molecules that cause the infected cell to burst. The other option is for the B Cells to develop into a plasma cell in order to secrete antibodies to bind to the virus antigens and later help the destruction of the infected cell. Finally the B Cells form long-lasting memory cells so if re-exposed to the same virus the specific type of antibodies will be made to destroy the old but re-occuring virus.