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305189 c-system - Lymphatic System Composition Lymph...

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Lymphatic Lecture Page 1 Lymphatic System Composition - Lymph - Lymphocytes - Lymph vessels - Lymph nodes - Tonsils - Spleen - Thymus gland Function 1) Maintains fluid balance - 30 liters of plasma pass out of capillaries each day - 27 liters get resorbed at capillary - 3 liter left in tissue spaces get resorbed into lymph vessels 2) Fat absorption from gastrointestinal tract - lacteals in small intestine - lymph + fat = chyle (a milky white fluid) 3) Body defense system - lymph nodes filter lymph contains lymphocytes - spleen filters blood Lymph Vessels Carry lymph away from tissues - begins at lymph capillaries (simple squamous epithelium) - lymph capillaries join together to form vein-like lymph vessels - lymph vessel contain valves to prevent retrograde flow o contraction of skeletal muscle o smooth muscle in lymph vessel wall o pressure changes in thorax during breathing 1) Right Lymphatic Duct (RLD) drains lymph from - right upper limb - vessels from right halve of head, neck, & chest form the RLD which empties into the right subclavian vein. 2) Thoracic Duct The rest of the body drains into the Thoracic Duct which empties into the left subclavian vein.
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Lymphatic Lecture Page 2 Lymph Organs - Contain lymphatic tissue composed of lymphocytes, macrophages, & other cells. - Lymphocytes originate from red bone marrow, and are carried by the blood to lymph organs. - Microorganisms stimulate lymphocyte cell division in germinal centers of lymph nodes. This is called Immune System Activation 1) Tonsils Protects body against pathogens entering at the nose and mouth.
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