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Details Title: Anatomy-Test2 Description: Lymphatic System Total Flash Cards: 17 Created: 02/28/2004 09:44:12	To study from this set of flash cards, or to create your own your own study flash cards, register HERE. If you are already a registered user, CLICK HERE.
Cards Term what is the lympathatic system? Definition works together to keep us healthy + alive Term What's lymph fluid? Definition flows through lymphatic vessels(resembles plasma, contains much lower concentration of suspended proteins) Term What's lymph vessels? Definition lymphatics, carry lymph from peripheral tissues to the venous system in all parts of the body except the CNS Term Lymphatic capillaries? Definition endothelium permits fluid to flow into the capillary Term lymph organs? Definition connected to lymphatic vessels (lymph nodes, spleen, & thymus Term what does the lymphatic system do? Definition -part of the body's immune response to pathogens, lymphocytes are primary cell type -prevents fluid build-up in tissues (these 2 functions occur stimultaneously-filter system) Term how does it work? Definition capillary dynamics: fluid movement between capillary & tissue(interstitial space), outward @ beginning of capillary & inward @ end of capillary due to osmosis, concentration gradients from proteins ect. -slightly more fluid pushed out than returned Term what happens to the excess fluid? Definition picked up by lymphatic capillaries -blind ends have one-way valves; fluid enters but cannot flow back into tissue -fluid is now lymph fluid -capillaries-larger vessels-two large ducts that empty into venous system *left lymphatic(thoracic)duct-near l. internal jugular vein(drains 3/4 of body) *r. lymphatic duct-near r. internal jugular vein, drains 1/4 of body -amount of fluid returned is large(3-4 liters/day) -fluid is moved by valves & nearby tissues(just like veins) Term what happens if lymph vessel is blocked? Definition can lead to edema(elephantiasis) Term how is lymph fluid filtered? Definition lymph nodules & nodes in route to venous system Term what are the purposes of nodules and nodes? Definition to remove & destroy pathogens & alert immune system Term what are nodules? Definition masses of connective tissue & lymphocytes, w/out fibrous capsule located near body openings & in GI tract(tonsils, lining of appendix) Term what are nodes? Definition masses of connect tissue & lymphocytes, w/ capsule located @ junctions of the system(neck, armpit, groin) & around important organs to prevent spread(pelvic & abdominal nodes) Term what resides in the nodules & nodes? Definition majority of lymphocytes do, to destory pathogens, few normally circulate Term what happens when you have an infection? Definition -causes extra lymphocytes to gather in node or nodule results in swelling -enlarged nodes can also indicate presence of cancer--cancer cells spread through lymph vessels & become trapped(breast cancer spreads to nodes under arm) nodes swell but are not painful Term what does the spleen do? Definition performs a similar filtering role for the blood -filters out aging RBCs -contains large #s of lymphocytes & phagocytes to destroy pathogens -enlarged during infections(more cells) & is easily ruptured even under normal circumstances (often removed bc it can't be repaired; removal does not cause any impairment bc liver takes over function Term where is the thymus and what does it do? Definition located above the heart, in front of aorta & trachea -doesn't directly attack pathogens, has indirect role helps lymphocytes learn to recognize specific pathogens(maturation) -important in childhood but not so much in adulthood