How intracellular fluid is formed and returned to the blood?

Maya Lorraine

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vinod kumar

Tissue fluid is a mixture of different substances (blood plasma) and is forced out of the capiliaries at the arterial end when under greater pressure. This would leave the remaining blood with a much higher concentration of solutes and less water. At the venous end of the capillary, does the blood still have a higher concentration of solutes (lower water potential) than the tissue fluid or not? The blood is also at this point at a low hydrostatic pressure. Different substances can be exchanged between tissue fluid and surrounding cells by the expected modes of transport - lipid diffusion, ions by facilitated diffusion, active transport and of course water by the process of osmosis. Consider at the venous end why aqueous tissue fluid is likely to reenter the capillary by osmosis - think water potential, solute concentration and pressure potential. Hope this helps!

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