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23 Cards in this Set
- Front
- Back
Lymphatic system
general functions |
2 general functions:
-maintain fluid balance -protect body from infection and disease |
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maintain body fluid
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lymphatic cappilaries take excess fluid from cappilaries, filter it, and bring back to the heart
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function of lymphatic system
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-immunity
-fluid recovery -lipid absorption |
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immunity
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-fluids from all cappilary beds are filtered
-immune cells stand ready to respond to foreign cells or chemicals encounteres |
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fluid recovery
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-absorbs plasma proteins and fluids(2-4l/day)from tissues and return it to the bloodstream
-interferance with lymph drainage leads to severe edema |
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Lipid Absorption
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lacteals in small intestines absorb dietary lipids
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lymph
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clear , colorless fluid, similar to plasma but much less protein
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lymphatic cappliaries are closed
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at 1 end
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lymphatic cappilaries are tethered
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to surrounding tissue by protein filaments
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lymphatic cappilaries and endotheliel cells
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loosely overlapped
-allow bacteria and cell enterance to lymphatic cappilary -creates valve-like flaps that open when interstitial fluid pressure is high, and close when its low |
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route to lymp flow
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lymphatic cappilaries
collecting vessels lymphatic trunks collecting ducts |
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collecting vessels
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course through many lymph nodes
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lymphatic trunk
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drain major portion of body
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collecting ducts
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right lymph duct
thorasic duct |
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right lymph duct
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empties into right subclavian
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thorasic duct
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larger and longer, empties into left subclavian vein
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lymph flows
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on pressure and speed
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lymph moves
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by rythmic contractions of lymphatic vessels
-stretching of vessel stimulates contraction |
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lymphatic flow aided by
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skeletal muscle
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aiding flow from thorasic cavity
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thorasic pump
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valves
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prevent backward flow
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what draws lymphs in
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rapidly flowing blood from subclavian veins
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helps lymphatic return
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exercizing
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