Formation of tissue fluid and lymph

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  • Formation of tissue fluid and lymph
    • hydrostatic pressure
      • water in plasma being forced out
        • by pressure of hearts contraction
    • blood cells and blood proteins cant pass
      • through basement membrane
        • they are left behind
    • tissue fluid must return to circulatory system
      • otherwise bodies will swell
        • condition called oedema
    • tissue fluid returns to the capillaries
      • by osmosis
        • movement of water through semi permeable membrane
          • from lower concentrated solution to higher
    • plasma forced out by hydrostatic pressure
      • = more water surrounds tissue
        • water drawn  back to the capillaries by osmosis
    • osmotic pressure
      • water being drawn back into capillaries by osmosis
        • due to presence of albumin in capillaries
    • as water returns to capillaries
      • takes dissolved carbon dioxide and other waste products
    • 10% of lymph is drained to the lymphatic system
      • drains into the lymph vessels
        • similar structure to veins
      • lymphatic system
        • one way transport system
        • leads from lymph capillaries
          • into tissues through lymph vessels
            • to join the circulatory system at the top of the chest
              • lymph drains into main veins
                • leading from arms to superior vena cava
                  • maintains correct blood flow volume
        • along this are swellings
          • = lymph nodes
            • nodes store and develop lymphocytes
              • screen returning tissue fluid
                • for pathogens
                  • destroys any that are found
                    • when fighting an infection nodes swell


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