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Bio 171 (topic 8)
| Question | Answer |
|---|---|
| What does the lymphatic system consist of | the lymphatic vessels, structures and organs that contain lymphatic tissue, and bone marrow |
| what does bone marrow produce | lymphocytes |
| what are the functions of the lymphatic system | drains interstitial fluid away from cells, transports dietary lipids and lipid soluble vitamins, contributes to immune response using B+T cells |
| what is the difference between the composition of lymph and interstitial fluid | location, has a similar composition to blood except it lacks formed elements and the larger proteins |
| What is the lymph flow | fluid leaves blood by filtration and re-enters by osmosis. filtration exceeds water by 3 liters per day and this fluid drains into the lymphatic system, lymphatic vessels then drain into venous blood at the junction of the jugular and subclavian |
| What is lymph flow driven by | the milking action of skeletal muscle movement and the respiratory pump |
| Where do lymphatic vessels begin | at closed-ended structures called the lymphatic capillaries |
| what are lymphatic nodules | small oval masses compromised of large numbers of lymphocytes meshed into connective tissue |
| where are lymphatic nodules found | beneath moist epithelial membranes (small intestine, respiratory airways, urinary tract and the reproductive tract) |
| where are lymph nodes located | surrounded by capsules of dense connective tissue and lie along the lymphatic vessels |
| What do the lymph nodes contain | cells associated with an immune response (B+T cells, plasma cells, macrophages) |
| what is the spleen | the largest mass of lymphatic tissue in the body and is located between the diaphragm and stomach |
| what does the spleen do | removes bacteria, worn out RBC's, platelets and other debris from circulation |
| what is the removal of the spleen | spleenectomy |
| Is a spleenectomy survivable | yes, the liver and bone marrow takes over some of its function |
| where is the thymus located | behind the sternum, between the lungs |
| what does the thymus do | site of T cell maturation |