Changes

==Filtration==

==Filtration==

However if you increase the pressure at one side of the membrane of the fluid as a whole you force more water through the membrane.  If enough pressure is applied to the side with the solute then it can overcome the pressure differances across the pores and reverse them causing water to flow against its concentration gradient.

However if you increase the pressure, on one side of the membrane, of the fluid as a whole you force more water through the membrane.  If enough pressure is applied to the side with the solute then it can overcome the pressure differances across the pores and reverse them causing water to flow against its concentration gradient. This is filtration.  The pressure of a fluid is termed the '''hydrostatic pressure'''. The point at which the hydrostatic pressure prevents the natural movement of water is called the osmotic pressure.  As the concentration of the solution becomes higher the greater the pressure required to overcome the natural movement of water therefore the greater the osmotic pressure.  Water moves