Chapt 20
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| 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
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| Lymph means what? | fluid
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| whats is lymph node? | lymphatic follicles
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| What are some characteristics of lymphatic capillaries? | -Remarkably permeable
-absorption of interstitial fluid
-lacteals-small intestines
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| Define minivalves | made up of endothelial cells
one way
-absorption of interstitial fluid
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| define lacteals | -small intestines
-absorb digestive lipids from the small intestines
-then lipids go into the blood
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| lymphatic collecting vessels | help move the lymph fluid
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| 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
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| vaso vasorum is what? | small blood vessels that supply the walls of large blood vessels
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| Lymphatic trunks | a. Thoracic duct
b.right lymphatic duct
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| Thoracic duct does what? | collects lymph from the lower body
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| right lymphatic duct does what? | collects lymph from upper body
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| Lymphoid cells: Macrophages | cleanses the lypmh
activate t & b cells
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| lymphoid cells: Dendritic cells | activate t&b cells
-Called APC(antigen presenting cells)
-antigen means any foreign object ie.toxin,virus,bacteria
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| Lymphoid cells: reticular cells | -reticular fibers
-covered by microphages
-filter
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| Lymphoid cells: Lymphocytes | T cells
-kill virus/bacteria infected cells
-kills cancer cells
-Bcells-immune cells
-make antibodies
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| B cells | Make antibodies
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| T cells | destroy the bacteria..kniwn as killer cells
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| Antigen | any foreign substance ie virus,bacteria,toxin
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| Diffuse Lymphatic tissue | -scattered in all organs
-immune cells
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| Where are there larger collections of lymphatic tissue? | The intestines/lungs
-Called MALT-mucosae lympatic tissue
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| Lymph nodes are the principal lymphoid organs of the body. Their two basic functions are? | -filter lymph
-assist immune system build immune response
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| What is the structure of the lymph node? | -fibrous capsule
-internal regions:1.cortec2.medulla
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| cortex of the lymph node contains- | contain lymphatic follicles or nodules with germinal centers
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| medulla | -Afferent lymphatic vessels (arrive) bring lymph into the lymph node
- Efferent lymphatic vessels (exit) leave the lymph node through the hilus.
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| Trabeculae | fibers-structure in the spleen ,connective tissue strands that extend in to divide the node into compartments
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| spleen | a large dark-red oval organ on the left side of the body between the stomach and the diaphragm
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| thymus | a ductless glandular organ at the base of the neck that produces lymphocytes and aids in producing immunity
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| Palatine Tonsils | located on the left and right sides of the throat in the area that is visible through the mouth
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| lingual tonsils | Collection of lymphoid follicles on the base, posterior, or pharyngeal portion of the dorsum of the tongue.
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| Pharyngeal Tonsils | a collection of lymphatic tissue in the throat behind the uvula (on the posterior wall and roof of the nasopharynx)
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| plasma cells | ells that develop from B cells and produce antibodies
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| macrophages | Found within the lymph nodes, they are phagocytes that destroy bacteria, cancer cells, and other foreign matter in the lymphatic stream.
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| dendritic cells | specialized white blood cells that patrol the body searching for antigens that produce infections
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| reticular cells | produce reticular fiber stroma (network for other cells)
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| stoma |
the supporting tissue of an organ (as opposed to parenchym
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| 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.
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| 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
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| 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)
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| capsule | sticky, gelatinous substance around the cell wall; allows cells to stick together or to the host cell
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| cortex | the tissue forming the outer layer of an organ or structure in plant or animal
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| medulla | the inner part of an organ or structure in plant or animal
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| medullary cords | extend from the cortex and contain B cells, T cells, and plasma cells
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| lymph sinuses | Spaces between these groups of lymphatic tissues. These spaces contain a network of fibers and the macrophage cells.
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| Afferent Lymphatic Vessels | Vessels that bring lymph draining from connective tissue into a lymph node en route to the blood.
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| Subcapsular Sinus | region within lymph node immediately deep to capsule, contains relatively sparse lymphocytes, allows lymph to flow freely through it
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| Hilum | anatomy) a depression or fissure where vessels or nerves or ducts enter a bodily organ
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| Efferent Lymphatic Vessels | Vessels leaving the lymph node
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| white pulp | That region of the spleen within PALS; predominant immune cell is the T cell and where primary T cell responses can occu
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| red pulp | consists of reticular cells and fibers(cords of Billroth), surrounds the splenic sinuses
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| 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
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| thymus | a ductless glandular organ at the base of the neck that produces lymphocytes and aids in producing immunity
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| Palatine Tonsils | located on the left and right sides of the throat in the area that is visible through the mouth
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| lingual tonsils | Collection of lymphoid follicles on the base, posterior, or pharyngeal portion of the dorsum of the tongue.
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| appendix | a vestigial process that extends from the lower end of the cecum and that resembles a small pouch
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| 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
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| 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
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| What are the functions of the lymphatic system? | fluid reclamation, fluid filtration, immune surveillance
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| he lymphatic system returns to the _____ any fluids that have escaped the blood vessels | blood
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| The lymphatic system filters fluid via phagocytic activity of _____ before returning it to the blood | macrophages
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| 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
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| lymph flows only toward the ______ in lymphatic vessels | heart
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| there are no lymph capillaries in the ___ | bone marrow, teeth, CNS
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| What are the cells that are found in the lymph nodes that stimulate the immune system to respond? | lymphocytes, macrophages
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Created by:
creyesz
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