Introduction to the Immune System

Introduction to the Immune System - The immune system's...

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Introduction to the Immune System Immunity is a state of specific resistance to infection. Specific resistance is directed  against a particular type of microorganism and is the single most important  characteristic of immunity. The  immune system  enables the body to recognize a foreign agent as  nonself , which  is something other than a person's own substances  (self).  The immune system takes a  specific action for neutralizing, killing, and eliminating that agent. The action involves  nonspecific resistance as well. On occasion, the immune system activity may lead to  tissue damage as seen in allergic disorders and other states of hypersensitivity. 
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Unformatted text preview: The immune system's activity is based on its ability to distinguish characteristic proteins or protein-linked components associated with alien substances. Once this distinction has been made, certain lymphocytes are provoked to produce antibodies directed against the foreign matter, while other lymphocytes are sensitized to the invading agent and react with it directly. Thus, there are two major branches of the immune system: antibody-mediated immunity (also known as humoral immunity) and cell-mediated immunity....
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This note was uploaded on 11/11/2011 for the course BIO 101 taught by Professor Pesthy during the Fall '07 term at Texas State.

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