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BIO_211_Ch20_Lecture Notes LymphSystem

BIO_211_Ch20_Lecture Notes LymphSystem - Bio 211 A P II The...

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Bio 211 A & P II The Lymphatic System – Organs & Tissues 1 Chapter 20 The Lymphatic System and Lymphoid Organs and Tissues Lymphatic System Consists of three parts 1 A network of lymphatic vessels (lymphatics) 2 Lymph 3 Lymph nodes Lymphatic System: Functions Returns interstitial fluid and leaked plasma proteins back to the blood Once interstitial fluid enters lymphatics, it is called lymph Together with lymphoid organs and tissues, provide the structural basis of the immune system Lymphatic Vessels One-way system, lymph flows toward the heart Lymph vessels (lymphatics) include: Lymphatic capillaries Lymphatic collecting vessels Lymphatic trunks and ducts Lymphatic Capillaries Similar to blood capillaries, except Very permeable (take up cell debris, pathogens, and cancer cells) Endothelial cells overlap to form one-way minivalves, and are anchored by collagen filaments, preventing collapse of capillaries Lymphatic Capillaries Absent from bones, teeth, bone marrow and the CNS Lacteals: specialized lymph capillaries present in intestinal mucosa Absorb digested fat and deliver fatty lymph (chyle) to the blood Lymphatic Collecting Vessels Similar to veins, except Have thinner walls, with more internal valves Anastomose more frequently Collecting vessels in the skin travel with superficial veins Deep vessels travel with arteries Nutrients are supplied from branching vasa vasorum Lymphatic Trunks Formed by the union of the largest collecting ducts Paired lumbar Paired bronchomediastinal Paired subclavian Paired jugular trunks
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Bio 211 A & P II The Lymphatic System – Organs & Tissues 2 A single intestinal trunk Lymphatic Ducts Lymph is delivered into one of two large ducts Right lymphatic duct drains the right upper arm and the right side of the head and thorax Thoracic duct arises from the cisterna chyli and drains the rest of the body Each empties lymph into venous circulation at the junction of the internal jugular and subclavian veins on its own side of the body
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