Our body
has self-defence mechanism system to guard the body against the harmful
influences from the body, known as Immunity System. It consists of
different white cells, organs, and tissues that work together to protect the
human body against invasion of foreign elements. These foreign elements may
manifest in form of uncountable numbers and varieties of bacteria, microbes,
toxins and parasites that cause many types of ailments and diseases. It is the
immunity system which prevents our body from harmful effects of these elements
and keeps human body healthy permanently.
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