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Review_II_Spring_2013 - I. LYMPHATIC SYSTEM STRUCTURE AND...

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I.LYMPHATIC SYSTEM STRUCTURE AND FUNCTIONA.The lymphatic system consists of a fluid called lymph flowing within lymphatic vessels,several structures and organs that contain lymphatic tissue (specialized reticular tissuecontaining large numbers of lymphocytes), and bone marrow, which is the site of lymphocyteproduction .1.Interstitial fluid and lymph are basically the same.2.Their major difference is location.B.The lymphatic system functions to drain interstitial fluid, return leaked plasma proteins to theblood, transport dietary fats, and protect against invasion by nonspecific defenses and specificimmune responses.C.Lymphatic Vessels and Lymph Circulation1.Lymphatic vessels begin as blind-ended lymph capillaries in tissue spaces betweencells .
2.Lymphatic Capillaries
3.Lymph Trunk and Ducts
c.Right Lymphatic Duct1.The right lymphatic duct drains lymph from the upper right side ofthe body.2.It drains lymph into venous blood via the right subclavian vein.D.Formation and Flow of Lymph1.Interstitial fluid drains into lymph capillaries.2.The passage of lymph is from arteries and blood capillaries (blood) to interstitialspaces (interstitial fluid) to lymph capillaries (lymph) to lymphatic vessels to lymphtrunks to the thoracic duct or right lymphatic duct to the subclavian veins (blood) .a.Lymph flows as a result of the milking action of skeletal muscle contractionsand respiratory movements.b.It is also aided by lymphatic vessel valves that prevent backflow of lymph.

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