Concept of immunity

THE CONCEPT OF IMMUNITY IN HUMAN BEINGS What is immunity? Immunity is the ability of a system to prevent and protect invasion from materials that are foreign to it. Immunity as regards to human is a physiological mechanism that give the individual the ability to recognize materials or substances which are foreign to itself, neutralize and eliminate such substances with or without causing harm to the individual. In other words, immunity is a system that can recognize the presence of certain diseases in the human body, destroy the disease and get rid of it from the body. The immune system has the sole ability to do these. Functions of the immune system 1. Defends the body against microorganisms. 2. Surveillance, recognition and destruction of microorganisms. 3. Maintains the internal condition of the body.

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