At start of capillary bed, nearest the arteries the hydrostatic pressure inside the capillaries is greater than the hydrostatic pressure in the tissue fluid
this difference in hydrostatic pressure means an overall outward pressure forces fluid out the capillaries and into spaces around the cells, forming tissue fluid
what are steps 3-4 of pressure filtration?
3- As fluid leaves, the hydrostatic pressure reduces in the capillaries- = the hydrostatic pressure is much lower at the VENULE end of the capillary bed
what is the venule end of the capillary bed?
The end that is nearest to the veins
what is step 4 of pressure filtration?
4- Due to fluid loss + an increasing conc of plasma proteins , the water potential at the venule end of the capillary bed is lower than the waterpotential in the tissue fluid
5- this means that some waterre-enters the capillaries from the tissue fluid at the venuleend by osmosis
