Lymph - Definition

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Lymph is a colorless or slightly yellowish liquid circulating in the lymphatic vessels that run throughout the human body. This liquid contains plasma, close to that of blood, but it also contains many leukocytes or white blood cells, hence its predominant action in the defense of the body. Lymph originates from a filtration of blood components in the capillaries and drains the body before returning to the bloodstream via the collecting duct. Lymph nodes, types of nodes in the path of lymph, filter and serve an important role in the "cleaning" and the quick-release reactions of defense against the entry of a microbe in the body. However, this lymphatic circulation is also a leading cause of the spread of cancer cells throughout the body, which generates the spread of cancer by metastasis.