Lymphatic System - (Chapter 20) 5.1 Describe the structure...

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(Chapter 20)
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2 parts: lymphatic vessels & lymphatic tissues/organs (i) lymphatic vessels: up to 3 L of “leaked” fluid plus plasma proteins returned to circulatory system (ii) lymphatic tissues/organs: essential in body defense/resistance to disease Lymphatic Vessels begins with microscopic blind-ended lymph capillaries ( lacteals ) everywhere except bones, teeth, bone marrow, CNS J. Carnegie, UofO 5.1 Describe the structure and explain the main functions of the vessels and organs of the lymphatic system Fig. 20.1
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lymph capillaries are very permeable: flap-like minivalves filaments anchor the endothelial cells to surrounding structures; What happens when fluid pressure builds up in tissues? Fig. 20.1
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Lymph Nodes clustered along lymphatic vessels; larger clusters where lymphatic vessels converge (inguinal, axillary, cervical regions ) (i) (ii) activate immune system Fig. 20.2a Right lymphatic duct drains from: Thoracic duct drains from:
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1. Lymphoid Cells fight infectious microorganisms that have penetrated epithelial layer & are starting to proliferate in underlying loose CT
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Lymphatic System - (Chapter 20) 5.1 Describe the structure...

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