The lymphatic system acts as a secondary circulatory system, except that it collaborates with white blood cells in lymph nodes to protect the body from being infected by cancer cells, fungi, viruses or bacteria.
The lymphatic system is a system of thin tubes that runs throughout the body. These tubes are called 'lymph vessels'.
Unlike the circulatory system, the lymphatic system is not closed and has no central pump. It is not under pressure and only moves because of exercise or muscle contraction. |