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Peranan kedua organ limfa adalah bagi memainkan peranan penting dalam sistem pertahanan badan, mempunyai pertindihan yang agak besar dengan sistem limfoid . Tisu limfoid terdapat dalam banyak organ, terutama nod limfa, dan pada folikel limfa yang berkaitan dengan sistem penghadaman seperti tonsil. Sistem ini juga merangkumi semua struktur yang khusus pada pengedaran dan pengeluaran limfosit, termasuk limpa, timus, sum-sum tulang dan tisu limfoid yang berkaitan dengan sistem penghadaman.<ref name=grays>{{cite book |last= Warwick|first= Roger|coauthors= Peter L. Williams|editor= |others= illustrated by Richard E. M. Moore|title= Gray's anatomy|accessdate= 2008-06-30|edition= Thirty-fifth|publisher= Longman|location= London|pages= 588–785|chapter= Angiology (Chapter 6)}}</ref>
Darah tidak bersentuhan secara langsung dengan sel-sel parenchymal dan tisu dalam badan, tetapi juzuk darah mula-mula keluar dari saluran darah pertukaran mikrovaskular menjadi cecair celahan, yang bersentuhan dengan sel-sel parenchymal badan. Limfa ialah cecair yang terbentuk apabila cecair celahan memasuki permulaan saluran limfa permulaanpada sistem limfa. The lymph is then moved along the lymphatic vessel network by either intrinsic contractions of the lymphatic passages or by extrinsic compression of the lymphatic vessels via external tissue forces (eg the contractions of skeletal muscles ). Limfa kemudian digerakkanbergerak di sepanjang rangkaian salur limfa sama ada olehmelalui pengecutan intrinsikdalaman petikan-petikanlaluan limfa atau oleh mampatan ekstrinsikluaran saluran limfa melalui angkatankuasa tisu luaran (contohnya pengecutan otot - otot rangka ). Eventually, the lymph vessels empty into the lymphatic ducts , which drain into one of the two subclavian veins (near the junctions of the subclavian veins with the internal jugular veins). Akhirnya, saluran limfa kosongmengalir ke dalam saluranurat limfa , yang mengalirkan menjadikedalam salah satu daripada dua urat subclavian subklavika(berhampiran persimpangan urat subclavian yangsubklavika dengan urat leher dalaman,jugulum).
==Terminologi==
Adjektif digunakan bagi sistem pengangkutan limfa adalah "limfatik". Adjektif yang digunakan bagi tisu di mana limfosit terbentuk adalah "limfoid".
Limfatik datang dari perkataan Latin lymphaticus, bererti "berkaitan dengan air".
The [[blood]] does not directly come in contact with the [[parenchyma]]l [[cell (biology)|cells]] and [[tissue (biology)|tissues]] in the body, but constituents of the blood first exit the microvascular exchange blood vessels to become [[interstitial fluid]], which comes into contact with the parenchymal cells of the body. Lymph is the fluid that is formed when interstitial fluid enters the initial lymphatic vessels of the lymphatic system. The lymph is then moved along the lymphatic vessel network by either intrinsic contractions of the lymphatic passages or by extrinsic compression of the lymphatic vessels via external tissue forces (e.g. the contractions of [[skeletal muscle]]s). <!--Lymph is indeed pumped by the lymphatic vessels themselves, albeit in some cases not exactly like blood is pumped by the heart DC Zawieja--> Eventually, the lymph vessels empty into the [[Lymphatic vessel|lymphatic ducts]], which drain into one of the two [[Subclavian vein|subclavian veins]] (near the junctions of the subclavian veins with the internal jugular veins).
==Terminology==
The adjective used for the lymph-transporting system is "lymphatic". The adjective used for the tissues where lymphocytes are formed is "lymphoid".
Lymphatic comes from the Latin word lymphaticus, meaning "connected to water".
<gallery widths="150px" heights="150px">
Image:Galen detail.jpg|[[Galen|"Claude Galien"]]. LithographLithograf byoleh Pierre Roche Vigneron. (Paris: Lith de Gregoire et Deneux, ca. 1865)
Gabriele_Falloppio.jpg|[[Gabriele Falloppio]]
Image:Bartolomeus Eustachius.jpg|PortraitPortret of [[Bartolomeo Eustachi|Eustachius]]
File:Olaus Rudbeck Sr (portrait by Martin Mijtens Sr, 1696).jpg|[[Olaus Rudbeck]] inpada [[1696]]
File:Thomas bartholin.jpg|[[Thomas Bartholin]]
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