Chapter_16_17%20Lymphatic%20System_Body%20Defenses_with%20Answers

Chapter_16_17%20Lymphatic%20System_Body%20Defenses_with%20Answers

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Organs of the Immune System
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The Lymphatic System • A specialized network of tissues & vessels scattered throughout the body One way system to the heart Starts at blind lymph capillaries in intercellular spaces ends when the lymph joins the blood circulation to the heart • Serves almost all body regions except osseous tissue, epithelium & CNS
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Lymphatic Capillaries Single layer of endothelial cells Large gaps allow larger molecules to get through Endothelial cells overlap & act as one-way valves opened by interstitial fluid pressure, allowing fluid to enter but not to leave
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The Lymphatic System What is lymph? excess interstitial/intercellular fluid a clear whitish/yellowish fluid containing lymphocytes, proteins What are lacteals? specialized lymphatic capillaries in the villi of the small intestines which absorb dietary fats , and return it bloodstream What is chyle? – A milky fluid consisting of lymph & emulsified fat, extracted from chyme (partially digested food) by lacteals during digestion
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The Lymphatic System Which substance emulsifies the dietary fats? and from where is it released? Bile from the liver What are some of the differences between blood capillaries and lymphatic capillaries? – Lymphatic capillaries are more permeable than blood capillaries and begin blindly – Lymphatic capillaries do not bridge 2 blood vessels
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Functions of the Lymphatic System Protection from infection: lymph nodes act as filters removing pathogens and tumor cells from lymph Fluid balance : lymphatic capillaries drain lymph back into the blood circulation Transporting dietary lipids : digested lipids absorbed into lacteals blood
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Lymphatic Vessels • Beaded appearance due to due to the one way valves • May be deep or superficial • Named according to their location, e.g. mammary lymphatic vessels femoral lymphatic vessels in the thigh tibial lymphatic vessels in the leg
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Lymphatic (Collecting) Ducts Right lymphatic duct: – receives lymph from the upper right quadrant right subclavian vein Thoracic duct: receives lymph from the rest of the body left subclavian vein Cisterna chyli? • an enlarged part of the thoracic duct in the lumbar region of the abdominal cavity temporarily stores lymph as it travels upward
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Lymphatic Flow
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Structure of a Lymph Node
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• Clusters of lymph nodes that service a particular area; e.g. – Cervical nodes – Axillary nodes – Inguinal nodes – Mesenteric nodes – Tracheobronchial nodes What are a buboes? a swelling of the lymph nodes
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Chapter_16_17%20Lymphatic%20System_Body%20Defenses_with%20Answers

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