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What are the 2 major roles of the lymphatic system?
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Lymphatic system

Chapt 20

QuestionAnswer
What are the 2 major roles of the lymphatic system? Return interstitial fluid to the blood supply and to filter the lymph activate the immune cells
Lymph means what? fluid
whats is lymph node? lymphatic follicles
What are some characteristics of lymphatic capillaries? -Remarkably permeable -absorption of interstitial fluid -lacteals-small intestines
Define minivalves made up of endothelial cells one way -absorption of interstitial fluid
define lacteals -small intestines -absorb digestive lipids from the small intestines -then lipids go into the blood
lymphatic collecting vessels help move the lymph fluid
Facts about lymphatic collecting vessels -3 tunics -internal valves-one way -more than you would find in veins -large lumens -run parallel to aerteries -pulsation compresses the lymphatic vessel
vaso vasorum is what? small blood vessels that supply the walls of large blood vessels
Lymphatic trunks a. Thoracic duct b.right lymphatic duct
Thoracic duct does what? collects lymph from the lower body
right lymphatic duct does what? collects lymph from upper body
Lymphoid cells: Macrophages cleanses the lypmh activate t & b cells
lymphoid cells: Dendritic cells activate t&b cells -Called APC(antigen presenting cells) -antigen means any foreign object ie.toxin,virus,bacteria
Lymphoid cells: reticular cells -reticular fibers -covered by microphages -filter
Lymphoid cells: Lymphocytes T cells -kill virus/bacteria infected cells -kills cancer cells -Bcells-immune cells -make antibodies
B cells Make antibodies
T cells destroy the bacteria..kniwn as killer cells
Antigen any foreign substance ie virus,bacteria,toxin
Diffuse Lymphatic tissue -scattered in all organs -immune cells
Where are there larger collections of lymphatic tissue? The intestines/lungs -Called MALT-mucosae lympatic tissue
Lymph nodes are the principal lymphoid organs of the body. Their two basic functions are? -filter lymph -assist immune system build immune response
What is the structure of the lymph node? -fibrous capsule -internal regions:1.cortec2.medulla
cortex of the lymph node contains- contain lymphatic follicles or nodules with germinal centers
medulla -Afferent lymphatic vessels (arrive) bring lymph into the lymph node - Efferent lymphatic vessels (exit) leave the lymph node through the hilus.
Trabeculae fibers-structure in the spleen ,connective tissue strands that extend in to divide the node into compartments
spleen a large dark-red oval organ on the left side of the body between the stomach and the diaphragm
thymus a ductless glandular organ at the base of the neck that produces lymphocytes and aids in producing immunity
Palatine Tonsils located on the left and right sides of the throat in the area that is visible through the mouth
lingual tonsils Collection of lymphoid follicles on the base, posterior, or pharyngeal portion of the dorsum of the tongue.
Pharyngeal Tonsils a collection of lymphatic tissue in the throat behind the uvula (on the posterior wall and roof of the nasopharynx)
plasma cells ells that develop from B cells and produce antibodies
macrophages Found within the lymph nodes, they are phagocytes that destroy bacteria, cancer cells, and other foreign matter in the lymphatic stream.
dendritic cells specialized white blood cells that patrol the body searching for antigens that produce infections
reticular cells produce reticular fiber stroma (network for other cells)
stoma the supporting tissue of an organ (as opposed to parenchym
reticular connective tissue Composed of reticular fibers within a gel-like ground substance. Cellular components are fibroblasts, lymphocytes, and other blood cells. Located in LYMPH NODES, SPLEEN, BONE MARROW.
Diffuse Lymphatic Tissue scattered reticular tissue elements and associated lymphocytes; found in about every organ but especially in mucous membrane lining the respiratory and digestive tracts
lymphoid Follicles solid, spherical bodies consisting of tightly packed reticular elements and cells- often form parts of larger lymphoid organs (found isolated in distal small intestine and appendix)
capsule sticky, gelatinous substance around the cell wall; allows cells to stick together or to the host cell
cortex the tissue forming the outer layer of an organ or structure in plant or animal
medulla the inner part of an organ or structure in plant or animal
medullary cords extend from the cortex and contain B cells, T cells, and plasma cells
lymph sinuses Spaces between these groups of lymphatic tissues. These spaces contain a network of fibers and the macrophage cells.
Afferent Lymphatic Vessels Vessels that bring lymph draining from connective tissue into a lymph node en route to the blood.
Subcapsular Sinus region within lymph node immediately deep to capsule, contains relatively sparse lymphocytes, allows lymph to flow freely through it
Hilum anatomy) a depression or fissure where vessels or nerves or ducts enter a bodily organ
Efferent Lymphatic Vessels Vessels leaving the lymph node
white pulp That region of the spleen within PALS; predominant immune cell is the T cell and where primary T cell responses can occu
red pulp consists of reticular cells and fibers(cords of Billroth), surrounds the splenic sinuses
splenic cords network of reticular cells which produce reticular fibers; spaces between fibers are occuplied by macrophages and blood cells that have come from the capillaries; located in spleen
thymus a ductless glandular organ at the base of the neck that produces lymphocytes and aids in producing immunity
Palatine Tonsils located on the left and right sides of the throat in the area that is visible through the mouth
lingual tonsils Collection of lymphoid follicles on the base, posterior, or pharyngeal portion of the dorsum of the tongue.
appendix a vestigial process that extends from the lower end of the cecum and that resembles a small pouch
Peyer's Patches Lymphoid follicles situated along the wall of the small intestine that trap antigens from the gastrointestinal tract and provide sites where B and T cells can interact with antigen
malt mucosa-associated lymphatic tissue; composted of Peyer's patches, tonsils, appendix and lymphoid nodules in the bronchii; protects passages that open to exterior from the nerver-ending onslaughts of foreing matter entering them
What are the functions of the lymphatic system? fluid reclamation, fluid filtration, immune surveillance
he lymphatic system returns to the _____ any fluids that have escaped the blood vessels blood
The lymphatic system filters fluid via phagocytic activity of _____ before returning it to the blood macrophages
The lymphatic system helps activate the functional immune system by exposing _____ to antigens being returned to the blood; thus activating (sensitizing) them to these antigens lymphocytes
lymph flows only toward the ______ in lymphatic vessels heart
there are no lymph capillaries in the ___ bone marrow, teeth, CNS
What are the cells that are found in the lymph nodes that stimulate the immune system to respond? lymphocytes, macrophages
Created by: creyesz
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