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30 Cards in this Set

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lymphatic system
one way drainage system that collects excessive tissue fluid and transports lymph to CV system, also transports chyle, produces lymphocytes, and the lymphatic tissues and organ help from immune system
chyle
fat laden lymph from lacteals in digestive tract transported by lymph system to CV system, white due to absorption of lipids
site of lymphocyte production
in nodes and in thymus
lymph
fluid formed from the filtration of blood plasma that leaks out of capillaries and fluid in tissues from cells
lymph vessels
lymph capillaries, lymphatic/collecting vessels, lymphatic ducts, lymph nodes
lymph capillaries
microscopic endothelial tubes that begin blindly in tissue spaces and end in larger vessels
lacteals
lymph capillaries in villi of small intestine
lymphatic/collecting vessels
like veins but with thinner walls, more valves, and lymph nodes at intervals
lymphatic ducts
2 in #, thoracic duct and right lymphatic duct
thoracic duct
left lymph. duct, larger 18 inches, begins as dilation near 2nd lumbar vertebra, drains all parts of body except those located on Right side of body above diaphragm, enters CV at junction, valves prevent backflow of blood into duct
junction where thoracic duct enters CV system
junction of left internal jugular and subclavian veins
cisterna chyli
like a juicebox, the dialtion of the thoracic duct near the 2nd lumbar vertebra
right lymphatic duct
shorter, about 1/2 inch long, drains upper R side of body, empties at junction of R internal jugular and subclavian veins
lymph nodes
small bean shaped, afferent and efferent vessels, capsular extensions, 2 major parts, 3 major functions
trabeculae
capsular extensions of lymph nodes
afferent vessels of lymph nodes
vessels that enter into the LN
efferent vessels of lymph nodes
vessels that exit out of the LN
2 parts of lymph nodes
cortex with cortical sinuses and medulla with medullary sinuses
3 major functions of lymph nodes
produce lymphocytes from germinal centers of cortical nodules and medullary cords, produce plasma cells, filter pathogens and foregin particales
regulation of lymph flow
continuous production of new lymph, peristalsis of lymphatic vessels, squeezing action of skeletal muscles (valves prevent backflow, edema results if flow slowed or blocked)
lymphoid tissues
form waldyer's ring in pharynx, palatine tonsils, pharyngeal tonsils adenoid, lingual tonsils
lymph tissues composed of...
lymphatic nodules like Peyer's patches in ileum
GALT
gut associated lymphatic tissue
spleen
10% with o.5" in diam of accessory spleens, stores RBCs release during function, produce RBC's before birth, produce B cells which become plasma cells then antibodies, macrophages therein filter blood by phagocytosis, destroys worn out RBC's, w/ release of hemoglobin, white and red pulp
white pulp
lymphatic tissue + splenic nodules around arteries
red pulp
splenic cords associated with veins (sinusoids)
thymus gland
in superior mediastinum, key role in immune development, large in children
thymus role in Immune development
helps produce t-cells that directly or indirectly destroy invading microbes(cell mediated immunity)
thymus in children
large in children, maximum size reached during puberty, slowly grows to fat and connective tissue
involution
atrophy of thymus to fat and CT