Capillary Exchange

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  1. a. in closed system, exchange occurs at __
  2.                                                               i.      Capillary is a __ that we’re talking about
                                                                ii.      __ is great
    • capillary bed
    • Surface area
  3.                                                               i.      The greater the __ of an organ, the more capillary beds
    1.      There are more places for exchange because, if the tissue is __, it has a great demand for __and a desire to __
    • metabolic rate
    • metabolically active
    • oxygen and nutrients
    • get rid of wastes
  4. Two pressures operate in blood
    hydrostatic and osmotic
  5. Hydrostatic Pressure
    • 1.      Blood pressure; fluid pressure
    • a.      Pressure exerted by the fluid on the walls of the vessel
    •                                                                                                                                       i.      How fast or slow your heart is flowing
  6. Where does hydrostatic change pressure?
    1.      Decreases across the capillary (BPBà capillaries
  7. Hydrostatic always exerts force where?
    out of container it's in
  8. 1.      More material leaving capillary at __ due to __
    a.       What can’t get out are __; they’re too big
    2.      Forces blood out
    • arterial end
    • greater pressure
    • proteins
  9.                                                               i.      Osmotic pressure of interstitium, under normal conditions, is __
    1.      If there were one there, it would __                                   
    • zero
    • exert force into where solutes are
  10. Explain osmotic
    • 1.      Due to the ionic concentration of the solution (solute concentration and ionic, not just ionic)
    • 2.      Force is going to cause water to move inward
    • a.      There are more solutes inside
    •                                                                                                                                       i.      Solute concentration determines flow
  11. 1.      Osmotic pressure opposes __; __the direction where the solutes are
    2.      Does not change across the __; STAYS THE SAME __
    • hydrostatic pressure
    • in
    • capillaries
  12. Explain pressure on the arterial side.
    • 1.      AS LONG as HPb is greater than OPB, you’ll have material leaving the capillaries
    • a.       If the HPb is larger than than OPB, the net effect will be coming out
    • b.      The materials get dumped off
  13. Venous Side
    • 1.      The HPB is now lower than OPB, the net effect will be into the capillary
    • a.       CO2 and waste products to come back in
  14. Venous Side and water
    •                                                               i.      Not all water that leaves at arterial end returns to the blood at the venous end of capillary
    • 1.      The lymphatic capillaries in the area will pick up the excess water and eventually dump it back into cardiovascular system
    • b.      This becomes important in pathological condition
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Capillary Exchange
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