Lymphatic System (notes)

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  1. Lymphatic System (composed of)
    • 1. Organs
    • 2. Ducts
    • 3. Nodes
  2. Lymphatic System (functions)
    • 1. collect and return interstitial fluid to blood to maintain fluid balance
    • 2. defend body by maturing lymphocytes
    • 3. absorb lipids form the intestine and transport them to the blood
  3. Lymph
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    fluid and protein that has been squeezed out the blood
  4. Lymph Circulation
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    lymph Capillaries-->lymph Vessels-->lymph Trunks--> lymphatic Ducts
  5. Lymphatic Organs & Tissue Groups
    • Primary Lymphatic Organs & Tissues (sites where stem cells divide and become immunocompetent):
    • 1. Red Bone Marrow
    • 2. Thymus
    • Secondary Lymphatic Organs & Tissues (where most immune responses occur):
    • 1. Lymph Nodes
    • 2. Spleen
    • 3. Lymphatic Nodules
  6. Lymph Nodes
    • encapsulated oval structures, usually in group
    • filters to remove damaged cells and microorganisms
    • are the sire of proliferation of Bcells and Tcells
    • foreign substances trapped by nodal reticular fibers
  7. Lymph flows as a result of the milking action of
    • 1. Skeletal Muscle Pump- skeletal muscle contractions
    • 2. Respiratory Pump- respiratory movements
    • 3. Lymph vessels have valves- prevent backflow
  8. Ducts
    • return lymph back to blood stream
    • 1. Left Thoracic Duct
    • 2. Right Lymphatic Duct
  9. Left Thoracic Duct
    • main duct returns lymph back to blood stream at left subclavian vein
    • begin as dialation of cistema chyli
  10. Right Lymophatic Duct
    • receives lymph from the upper right side of the body
    • empties lymph to internal jugular vein
  11. Lymphoid Cells
    • 1. Lymphocytes (Bcells, Tcells)
    • 2. Macrophages
    • 3. Reticular cells
  12. Lymphocytes
    • warriors
    • made: red bone marrow
    • mature: lymphatic system-(Bcells, Tcells)
  13. T cells
    • manage immune response
    • some directly attack and destroy infected cells
    • (lymphoid Tcell)
  14. B cells
    • protect by making plasma cells (daughter cells) that secrete antibodies into the blood
    • (lymphoid Bcell)
  15. Antibodies
    mark antigens for destruction by phagocytes or other means
  16. Macrophages
    phagocyte foreign substances and help activate T cellls

    dendric cells- capture antigens and bring them back to lymph nodes
  17. Reticular cells
    • produce stroma (reticular fibers)
    • network that supports the other cell types in lymphoid organs
Card Set:
Lymphatic System (notes)
2013-11-07 04:13:32

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