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Unformatted text preview: 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 da y - 27 liters get resorbed at capillary - 3 liter left in tissue spaces get reso rbed 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 epith elium) lymph capillaries join together to form vein-like lymph vessels lymph ves sel contain valves to prevent retrograde flow o contraction of skeletal muscle o smooth muscle in lymph vessel wall o pressure changes in thorax during breathin g 1) Right Lymphatic Duct (RLD) drains lymph from - right upper limb - vessels fro m right halve of head, neck, & chest form the RLD which empties into the right s ubclavian vein. 2) Thoracic Duct The rest of the body drains into the Thoracic D uct which empties into the left subclavian vein. Lymphatic Lecture Page 1 Lymph Organs- Contain lymphatic tissue composed of lymphocytes, macrophages, & other cells. - Lymphocytes originate from red bone marrow, and are carried by the blood to ly mph organs. - Microorganisms stimulate lymphocyte cell division in germinal cent ers of lymph nodes. This is called Immune System Activation 1) Tonsils Protects body against pathogens entering at the nose and mouth. a. palatine body against pathogens entering at the nose and mouth....
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This note was uploaded on 02/28/2012 for the course BIO 1101 taught by Professor Robinson during the Spring '09 term at University of Central Florida.
- Spring '09