Human Immune System

Topics: Immune system, Bacteria, Natural killer cell Pages: 2 (559 words) Published: October 30, 2012
Human Immune System

Inside your body there is a mechanism designed to defend you from millions of bacteria, microbes, viruses, toxins and parasites. Inside your body there is an amazing protection mechanism called the immune system. It is designed to defend you against millions of bacteria, microbes, toxins, viruses and parasites that would love to invade your body. When something dies, its immune system (along with everything else) shuts down. In a matter of hours, the body is invaded by all sorts of bacteria, microbes, parasites... None of these things are able to get in when your immune system is working, but the moment your immune system stops the door is wide open. Once you die it only takes a few weeks for these organisms to completely dismantle your body and carry it away, until all that's left is a skeleton. The human immune system is made up of a number of interdependent cell types which collectively protect the person's body from various parasitic, fungal, bacterial and viral infections, as well as from the growth of tumor cells. |

A number of these cell types have specialized functions, are able to kill parasites, engulf bacteria, or kill tumor cells or viral-infected cells. Frequently, these cells are dependent upon the, 'T,' helper subset for activation signals in the form of secretions which are more formally referred to as, 'Lymphokines,' 'Cytokines,' or specifically as, 'Interleukins.' An understanding of the T helper subset may assist in comprehension of the root of immune deficiencies, as well as perception of the potential avenues that the human immune system can be modulated in the case of particular diseases. Immune Response - The presence of an APC, combined with a T cell or B cell, is required in order for there to be an immune response to a foreign antigen. Should an APC present an antigen on its cell surface to a B cell, for example, the B cell is signaled to proliferate and produce antibodies....
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