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Unformatted text preview: sometimes shape or charge) of the solute. Thus, at the level of the capillary, blood is "filtered" and small solutes (and water) move out of the blood into the tissues. At the arterial end of a capillary bed, the relatively high blood pressure (enough to override the osmotic pressure driving fluid into the blood) drives additional fluid out of the blood. This tendency for water movement out of the blood is balanced somewhat by the high colloid osmotic pressure of the blood. The blood contains impermeable proteins (albumins) that maintain the osmolarity of the blood and regulate the loss and reabsorption of water. At the venous end of the capillary bed, blood pressure is lower and the COP is the same. The high blood COP (due to albumins) will cause water to be reabsorbed and move into the blood by osmosis . Thus, there is a net flow of water back into the capillaries. (See Figure 11) Figure 11...
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- Fall '10
- Anatomy, Capillary, Blood vessel, capillary walls, intercellular clefts