Glomerular filtration occurs when plasma passes through these three layers from the blood and into the tubular component the nephron. This movement is passive and largely based on pressure and diffusion gradients. Three major pressure forces within the system affect the direction filtration occurs. For each of these forces, select whether it favors or opposes filtration into the tubular component, and enter the average magnitude of that pressure. Then, select what the combined results of these forces are on the net filtration pressure. Force Effect Magnitude(mm Hg). Glomerular capillary blood pressure Opposes filtration Plasma-colloid osmotic pressure Favors filtration Bowman's capsule hydrostatic pressure Opposes filtration Net filtration pressure Favors filtration From the relative magnitude of each of these forces, it is clear that glomerular capillary blood pressure force that drives glomerular filtration. is the major se three filtration layers is known as the glomerular filtration rate (GFR). Ideally, the plasma-colloid osmotic pressure be affected by changing any of the three pressure forces affecting glomerular Bowman's capsule hydrostatic pressure glomerular capillary blood pressure the nervous system will the which will in tum the GFR