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JODHAA AKBAR

Osmotic Pressure

Now on Osmotic,

Why can osmotic forces be thought of as pressures? Do you know any way to
measure these forces as pressures?

The total force acting on water at any point along the vessel, called the
filtration pressure will be the sum of the two forces; this is called the STARLING
HYPOTHESIS. For water in the formation of lymph it can be written as:

Filtration pressure = Phydrostatic + Πosm
To find the filtration rate, we need to also consider a permeability
(conductance -- review early material from lab) factor determined largely by the density of
capillary pores -- the more pores, the more water can move for a given filtration pressure:
Filtration rate = k * (Phydrostatic + Πosm)
where k is the conductance for water.

Let's look at this equation in detail. IF EVERYTHING ELSE REMAINS
CONSTANT:
if the capillary hydrostatic pressure (Pcap) increases or the tissue
hydrostatic pressure decreases, there will be a greater pressure tending to drive materials
across the membrane and the filtration rate will increase.

By contrast, a relatively higher intercellular fluid osmotic pressure
(Πicf) will tend to encourage fluid to leave the capillary as will a relative lower tubule osmotic pressure.

If you would like to know more,check it out on Wiki.