Research Paper, Essay on Biology, The Immune System

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Essay/Term paper: The immune system

Essay, term paper, research paper:  Biology

The immune system is a group of cells and organs that defend the body against invaders causing disease. The immune system is made up of mostly white blood cells and their contact with lymph nodes, spleen, tonsils, intestines, and lungs. The immune system rejects and attacks any substances not normally present within the human"s body. Innate, or nonspecific, immunity, is functioned by the skin, tears, mucus, and saliva. These barriers protect the body from a disease"s entrance, but do not prevent it. Adaptive, or specific, immunity processes when invaders actually attack the body. In adaptive immunity, proteins called antibodies appear in body fluids to fight bacteria and toxins, while other cells in adaptive immunity resist a virus" reproduction within cells. Resistance called immunity is reached by active or passive immunization. Active immunization occurs when a person"s immune system becomes activated and generates a response or by a vaccination. Natural immunization is controlled by a person"s immune system, while a vaccination is a chemically-created weakened form of the disease unable to cause harm. Passive immunization is when a person receives only temporary immunization by the use of antibodies. Disorders of the immune system range widely. Deficiencies within the immune system may be acquired or inherited. Acquired disorders, such as HIV and AIDS, can be caused by infections or other factors. Environmental factors such as stress and poor nutrition can also weaken the immune system.