So we see that the exchange in our fluid between the wall of the capillary takes place due to these junctions and slits between the endothelial cells. Now, the reason it takes place, the reason we have a net fluid flow is because of a difference in pressure. On the arterial side, we have a greater hydrostatic pressure than azmodic pressure. So we have have a net movement of out of the capillary into our tissue. But on the Venuel side, the opposite is true. The hydrostatic pressure is less than asthmatic pressure.