Lymphatic system
a part of the defense system (immune system) of vertebrate animals against pathogens
The lymphatic system, or lymphoid system, is an organ system in vertebrates that is part of the immune system and complementary to the circulatory system. It consists of a large network of lymphatic vessels, lymph nodes, lymphoid organs, lymphatic tissue and lymph. The Latin word for lymph, lympha, refers to the deity of fresh water, "Lympha".
Unlike the circulatory system, which is a closed system, the lymphatic system is open. Lymph originates in the interstitial fluid that leaks from blood in the circulatory system into the tissues of the body. This fluid carries nutrients to the cells and collects waste products, bacteria, and damaged cells, before draining into the lymphatic vessels as lymph. The circulatory system processes an average of 20 litres (5.3 US gal) of blood per day through capillary filtration, which removes plasma from the blood. Roughly 17 litres (4.5 US gal) of the filtered blood is reabsorbed directly into the blood vessels, while the remaining 3 litres (0.79 US gal) are left in the interstitial fluid. The lymphatic system provides an accessory return route to the blood for this remainder.
The other main function is that of immune defense.
“Lymphatic system” enters the record as a part of the defense system (immune system) of vertebrate animals against pathogens. Crown Archives preserves that source wording while asking what Lymphatic, system and part can confirm, complicate or overturn.
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“Lymphatic system” is worth following because a concise public description often conceals a longer documentary argument. Here, Lymphatic, system and part provides the most credible route into that argument.
Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Sep 18, 2026. The linked authority identifier is Q712604. The Library of Congress control number is sh85079132. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank.
The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “Lymphatic system” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.