Final answer:
The high pressure in the glomerular capillary is due to the osmotic pressure inside the capillary being higher than in Bowman's capsule. This pressure pushes fluid across the capillary wall into Bowman's space. The high pressure is important for the process of glomerular filtration.
Step-by-step explanation:
To understand why there is high pressure in the glomerular capillary, we need to look at the microenvironment on either side of the filtration membrane. The osmotic pressure inside the glomerular capillary is higher than the osmotic pressure in Bowman's capsule due to the presence of large proteins that cannot pass through the filter. This creates a net filtration pressure (NFP) of about 10 mm Hg, which pushes fluid across the capillary wall into Bowman's space. The high pressure in the glomerular capillary is important for the process of glomerular filtration.