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Unit 5-Lecture 1.pptx - Unit 5-Immunity Lecture 1-The...

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Unit 5-Immunity Lecture 1-The Lymphatic System
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Consists of two parts: A network of lymphatic vessels Lymphoid tissues and organs scattered throughout the body Returns interstitial fluid and leaked plasma proteins back to the blood Lymph – interstitial fluid once it has entered lymphatic vessels Lymphatic System: Overview
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3 Lymphatic System Organs, vessels and a fluid called lymph similar to interstitial fluid Organs involved red bone marrow thymus spleen lymph nodes diffuse lymphatic tissue tonsils, adenoids & peyers patches
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Lymphatic System: Overview Figure 20.1a
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Lymphatic Vessels and Lymph Circulation Lymphatic vessels begin as blind-ended lymph capillaries in tissue spaces between cells. Interstitial fluid drains into lymphatic capillaries, thus forming lymph . Lymph capillaries merge to form larger vessels, called lymphatic vessels , which convey lymph into and out of structures called lymph nodes.
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Lymphatic Vessels & Circulation Capillaries that begin as closed-ended tubes found in spaces between cells Combine to form lymphatic vessels resemble veins with thin walls & more valves Fluid flows through lymph nodes towards large veins above the heart lymph emptied into bloodstream
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Lymphatic Capillaries Found throughout the body except in avascular tissue (cartilage, epidermis & cornea) Structure is designed to let tissue fluid in but not out anchoring filaments keep tube from collapsing under outside pressure overlapping endothelial cells open when tissue pressure is high (one-way valve)
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Have the same three tunics as veins 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 Collecting Vessels
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