Ch.20: lymphatic system Flashcards
Function of lymphatic system
Returns fluid that have leaked from the blood to the vascular system back to the blood
The lymphatic system consist of three part
lymphatic vessels(network) Lymph, the fluid contained in those vessels Lymph nodes (cleanse the lymph as it passes)
The lymphatic vessels form ____ way system in which the lymph flows only toward the heart
one way
__________ transport of lymph begins, they weave through tissues cells and blood capillaries , widespread but absent from bones, teeth, bone marrow and the entire central nervous system
Lymphatic capillaries
The _______ form the walls of the lymphatic cappilaries, contains minivalves
endothelial cells
__________ anchor the endothelial cells to surround the structures so that any interstital fluid volume opens the minivalves , prevent collapse
Collagen filaments
_________ transport absorbed fat from the small intestines to the blood stream
LActeal
_______, fatty lymph, that drains from the fingerlike villi of the intestinal mucosa
Chyle
The largest collecting vessels unite to form ________, which drain fairly large areas of the body
Lympphatic trunk
Lymph transport:
low pressure conduits the milking action of active skeletal muscles pressure changes in the thorax valves to prevent backflow Pulsation of nearby arteries smooth muscle, peristalsis
_______ the main warriors of the immune system
Lymphocytes
__________ phagocytizing foreign substances and by helping to activate t cells
Macrophages
Spiny-looking __________ that capture antigens and bring them back to the lymphnodes
Dendritic cells
__________ (langerhans cells), fibroblast like cells that produce the reticular fiber stroma, which is the network that supports the other cell types in lymphoid organs and tissues
Reticular cells
_________ houses and provides proliferation site for lymphocytes and furnishes an ideal surviellence vantage point for lymphocyes and macrophages
lymphoid tissue
Two types of lymphoid tissue
Diffuse lymphoid tissue (loose arrangement, lining) lymphoid folliciles (nodules) (solid, spherical, ly,phoid cells and reticular fibers)
____________, principal lymphoid organ, cluster along the lymphatic vessels of the body: FILTRATION AND IMMUNE SYSTEM ACTIVATION
Lymph nodes
Structure of Node
capsule
trabaculae
cortex and medulla, medullary cords and lymph sinuses
Circulation of Lymph nodes
Afferent lymphatic vessel subcapsular sinus medullary sinuses hilium efferent lymphatic vessels
Function of Spleen
provides a site for lymphocyte proliferation and immune surviellence and response
Stores some of the breakdown products
Stores blood platelets and monocytes
site of erythrocite production in fetus
____________ are set of distributed lymohoid tissues strategically locates in mucous membranes throughtout the body , protects us from the never ending on slaught of pathogens
MALT Mucosa assosciated lymphoid tissue
Largest collections of MALT
tonsils, peyer’s patches and appendix
Four tonsils are
Palentine tonsiles (largest) lingual tonsils (base of tongue) pharyngeal tonsils (adenoids, nasopharnx) tubal tonsils ( auditory tubes)
________, or aggregated lymphoid nodules are large clusters of lymphoid follicles, small intestine
Peyer’s patches
__________, concentration of lymphoid follicles, destroys bacteria before reaching intestinal wall, generate memory lymphocytes for long term immunity
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