The Immune System For Agents

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The immune system performs specific defense against agents, the antigens that are foreign or harmful to the body. Exogenous antigens are often in contact with the skin or entering the airway, the digestive tube and the genital orifices and mucosae. They can also penetrate the circulation directly through wounds. The body has many defense mechanisms against foreign pathogenic agents. These mechanisms are divided into two groups: the specific mechanisms and the unspecific mechanisms. The specific mechanisms are part of the immune system and comprehend the humoral immune response and the cellular immune response that respectively produce antibodies and defense cells against specific antigens. The unspecific mechanisms fight in a general manner any type of antigen and in them a series of defense means are included, like the skin barrier against foreign agents, the mucous and ciliated epithelium of the airway, inflammation and the action of unspecific proteins and defense cells.
The immune system in biological entities consists of those behaviors, structures and processes that protect against assault from outside forces. In medicine, only the latter is usually considered under the heading of "immunology" but to biologists consider all three mechanisms as part of the defense system. Behaviors can be a simple gesture such as pulling a tick out of the skin is technically an immune response. So are spitting and crying. In fact, the act of crying entails two of the responses: bulk
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