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osmotic vs hydrstatic definition
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jsulli03
#1 Posted : Tuesday, June 17, 2014 11:31:06 PM
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I missed the definition in class of osmotic vs hydrostaitc pressure. Could someone explain what they are?

I'm confused as to which is caused by high/low concentrations of solutes and what is actually moving in and out in both.

Thank you.
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seancai
#2 Posted : Wednesday, June 25, 2014 1:06:52 AM
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Hi Jsulli03,

Excellent question! The hydrostatic pressure is the pressure exerted by the fluid volume inside a vessel. This pressure constantly pushes against the vessel wall and is trying to push fluid out of the vessel. Osmotic pressure on the other hand, is the pressure exerted by the proteins that are in the blood. The high concentration of proteins in the blood is constantly trying to draw fluid into the vessel from the extracellular space to lower the protein concentration in the blood.

Hope this helps and happy studying!

Cheers,

Sean
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