limitlesspuffy
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#1
Report Thread starter 10 months ago
#1
The question is dissolved ions diffuse between blood plasma and tissue fluid.
Pressure differences at the arterial and venous ends of capillaries are responsible for the
formation of tissue fluid. The following measurements were made in one capillary:
• Net hydrostatic pressure at the arterial end was 4.6KPa
• Net oncotic pressure was −3.0KPa
• Net hydrostatic pressure at the venous end was 2.3KPa.
Use this information to explain the movement of fluid in and out of a capillary.


Why does the mark scheme say to 'ignore osmosis'. For example, the fluid moves out of the capillaries through osmosis. Why is this wrong? Because this is kind of what it says in the textbook?
Last edited by limitlesspuffy; 10 months ago
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zlan
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It isn't osmosis though is it water and ions is FORCED out the pores because of high blood (hydrostatic) pressure due to contraction of left ventricle
Remember ions can't move by osmosis
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limitlesspuffy
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#3
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(Original post by zlan)
It isn't osmosis though is it water and ions is FORCED out the pores because of high blood (hydrostatic) pressure due to contraction of left ventricle
Remember ions can't move by osmosis
oh okay thank you!
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zlan
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#4
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Also if it came up why not osmosis remember there are plasma proteins which lower the water potential gradient so water wouldn't move in by osmosis and the gradient would most likely is maintained by the high blood pressure pushing everything along
Hope this helps
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