BLG 10A/B Lecture Notes - Lecture 20: Lymphatic Vessel, Extracellular Fluid, Adaptive Immune System

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Chapter 20 and 21 lymphatic systems, lymphoid organs + tissues and immunity. Lymphatic system returns fluids leaked from blood vessels back to blood, 3 parts: 1. Lymphoid organs and tissues provide structural basis of immune system by housing phagocytic cells and lymphocytes. Structures include spleen, thymus, tonsils, lymph nodes, other lymphoid tissues. Lymphatic system returns interstitial fluid and leaked plasma proteins back to blood: circulates ~ 3l interstitial fluid per day, once interstitial fluid enters lymphatics, it"s called lymph. Lymphatic vessels offer a one-way system, ensuring lymph flows only toward heart. Lymphatic capillaries: blind-ended vessels that weave tissue cells and blood capillaries. Similar to blood capillaries, but more permeable: can take up larger molecules and particles that blood capillaries cannot. Ex. proteins, cell debris, pathogens, and cancer cells. Can act as route for pathogens or cancer cells to travel throughout body. Increased permeability due to two specialized structures: 1. Endothelial cells overlap loosely to form one-way mini valves: 2.

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