Biology: Lymphatic system Part 1

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Lymphatic system with lymph nodes and organs. Note: There are also parts of the Lymphatic system in the groin, arms, legs, neck and head.

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The Lymphatic system is a system of organs, ducts and nodes. It transports a watery clear fluid called lymph. It also interacts with the blood circulatory system to drain fluid from cells and tissues. The lymphatic system contains immune cells called lymphocytes, which protect the body against antigens (viruses, bacteria, etc.) that invade the body.

Lymph nodes may become enlarged due to a tumor or infection. White blood cells are located within honeycomb structures of the lymph nodes. Lymph nodes are enlarged when the body is infected due to enhanced production of some cells and division of activated T and B cells. In some cases they may feel enlarged due to past infections; although one may be healthy, one may still feel them residually enlarged."

Whats a lymph node? That will be dicussed in part two.

Sources:
Pic: Wikipedia.
lymphomation.org