Final answer:
The venous drainage of blood to the CPBP venous reservoir is determined by capillary hydrostatic pressure (CHP), blood colloid osmotic pressure (BCOP), and the net filtration pressure (NFP).
Step-by-step explanation:
The venous drainage of blood to the CPBP (Central PeriBulk Point) venous reservoir is determined by a combination of factors including capillary hydrostatic pressure (CHP), blood colloid osmotic pressure (BCOP), and the net filtration pressure (NFP). Close to the arterial end of the capillary, the NFP is positive, driving fluid out of the capillary through filtration. At the middle of the capillary, the NFP drops to zero and there is no net change in volume. Near the venous end of the capillary, the NFP is negative, which leads to reabsorption of fluid into the capillary.