Why can we compare the glomerulus to a soaker hose?
Through holes in its wall. The amount of water that escapes depends on the pressure of the water flowing through the hose. If the pressure increases more water is forced out through the holes. The glomerular capillary is the place where water and anything else that is small enough passes through holes in the capillary wall and leaves the blood. If the pressure in the glomerular capillary increases the amount of filtration will also increase. We can control the amount of water coming out of our soaker hose by controlling the pressure in the soaker hose. We can control the amount of traction occurring in the glomerular capillary but controlling the glomerular capillary pressure.