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47 Cards in this Set
- Front
- Back
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what does the lymphatic system include
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lymphatic vessels, lymph nodes, collecting ducts, tonsils, spleen, thymus, appendix, and red bone marrow
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what are the 3 functions of the lymphatic system
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maintain fluid balance, fat absorption, and defense
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how does the lymphatic system maintain fluid balance
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vessels transport excess fluid from interstitial spaces and return to the bloodstream
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how does the lymphatic system absorb fat
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lacteals absorb digested fats and take them to venous circulation
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what are lacteals
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lymphatic capillaries
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where are lymphatic capillaries or lacteals located
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in the lining of the small intestines
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what do the lacteals do
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absorb fat that has been digested and transport them to the venous circulation
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how does the lymphatic system protect the body's defense
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it protects the body against infection by pathogens
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what is lymph
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it is the fluid carried by lymphatic vessels
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what does lymph resemble
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blood plasma
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what does lymph contain
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water, ions, nutrients, gases, protein, hormones. and waste products
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what do lymphatic vessels resemble
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veins
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why do lymph vessels resemble veins
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they have a one way valve
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onther than a one way valve what does a lymph vessel contain
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closed terminal end
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how else are lymphatic vessels similar to veins? what is their structure
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tunica externa, tunica media , and tunica interna
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what is the function of lymphatic vessels
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carry materials away from cells in tissue to venous system
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what are the 2 collecting ducts
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the right lymphatic duct and the thoracic duct
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from where does the right lymphatic duct collect lymph from
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right upper quadrant of body
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where does the right lymphatic duct empty the lymph into
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into the right subclavian vein
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where does the thoracic duct get its lymph from
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the rest of the body
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where does the thoracic duct empty its lymph
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into the left subclavian vein
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what is lymphatic tissue made of
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reticular connective tissue
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what does lymphatic tissue contain
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lymphocytes , macrophages, and dendritic cells
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what 2 things does the lymph node do
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filters lymph and monitors body fluids
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how many lymph nodes are there
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500-600
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where are lymph nodes located
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embedded in connective tissue
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where are the lymph node clusters located
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cervical, axillary and inguinal
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how do lymph nodes filter lymph and monitor body fluid
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phagocytosis by lymphocytes and macrophages
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what surrounds a lymph node
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a capsule
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what is the capsule that surrounds a lymph node made of
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connective tissue
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what do afferent vessels do int he lymphatic system
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bring lymph into the node
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what do efferent vessels do in the lymphatic system
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takes lymph away from node
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where does the lymph exit in the in the node
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through hilum
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what is the cortex of the lymph node made of
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lymph nodules which contain germinal centers
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what do the germinal centers contain
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b cells and macrophages
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what does the medulla in a lymph node contain
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b cells, plasma cells, and macrophages
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what is the largest organ of the lymphatic system
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spleen
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what lines the spleen
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a capsule(connective tissue)
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what structures make up the spleen
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red and white pulp
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what 2 things does red pulp contain
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blood vessels and erythrocytes
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what 2 things are
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germinal centers and b cells
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what is white pulp made of
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lymphatic tissue
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what 4 things does the spleen do
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blood cell production, stores blood cells, defense, kills rbc
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what is the function of the thymus gland
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houses lymphocytes which become mature t cells
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what is thymus replaced by in the elderly
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adipose (regresses as we get older)
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what are the 2 structures in the thymus
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medulla and cortex
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what does the medulla contain
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thymic corpuscles
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