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What is an immune system?

What is an immune system? Here are some definitions.

Noun
  1. (anatomy) The system that differentiates self from non-self and protects the body from foreign substances and pathogenic organisms by producing an immune response. It includes organs such as the thymus, the spleen and lymph nodes; tissue such as bone marrow, and lymphoid tissues such as the tonsils; cells such as lymphocytes including the B cells and T cells, and cell products such as antibodies.
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Vitamin C in the beans is crucial for a strong immune system and production of the stress hormone adrenalin.
It is also believed that exposure of the skin to heat stimulates the production of white blood cells and strengthens the immune system.
A general comment is that this decade, we have had major advances in understanding the immune system and major advances in developing medication.
A true food allergy is an abnormal response to a food triggered by the immune system.
It's good for muscular aches and pains, sinusitis, minor chest complaints and for when your immune system needs a bit of a boost.
Adherence of normal, beneficial flora reduces over-stimulation of the immune system.

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