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Unlike most of the other body systems, the immune system is scattered throughout the body.The main defence against invaders such as bacteria and viruses are white blood cells called lymphocytes.

These blood cells are made and stored in the body's lymphatic system, which is a network of thin tubes running throughout the body.

It contains a watery liquid called lymph, which it drains from the tissues and returns to the blood. At intervals along the length of the lymph vessels are small lump read more...

Tags: body, cells, healing, bacteria, viruses

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