Final answer:
The forces involved in glomerular filtration are hydrostatic pressure and osmotic pressure, which promote and oppose the movement of fluid, respectively.
Step-by-step explanation:
The correct labels for the forces involved in glomerular filtration are hydrostatic pressure and osmotic pressure. The process of glomerular filtration is driven by hydrostatic pressure, which is the force exerted by the fluid on the walls of the glomerulus. This pressure promotes the movement of fluid across a semipermeable membrane. Conversely, osmotic pressure opposes this movement; it is created by the solute concentration differences on either side of the membrane and draws fluid back into the capillaries. In summary, glomerular filtration occurs when the glomerular hydrostatic pressure exceeds the opposing forces, resulting in a net filtration pressure that facilitates the filtration of blood in the kidneys.