Final answer:
Each kidney has a blood flow rate of 1050 mL/min, and the renal plasma flow is determined by the hematocrit, which if 45% leads to 578 mL plasma/min. The GFR accounts for 19% of the plasma flow, yielding 110 mL filtrate/min, with a fraction (0.8%) amounting to 0.9 mL urine/min.
Step-by-step explanation:
Every minute, a single kidney has approximately 1050 mL of blood flow through it. The renal plasma flow can be calculated by taking into account a person's hematocrit. For instance, if the hematocrit is 45%, the renal plasma flow is 55% of the blood flow. Therefore, for an individual with a hematocrit of 45, about 578 mL plasma/min would flow through the kidney. This plasma contributes to the glomerular filtration rate (GFR), which is about 19% of the renal plasma flow, resulting in approximately 110 mL filtrate/min. A fraction of this filtrate, about 0.8%, is not reabsorbed and eventually becomes urine, equating to roughly 0.9 mL urine/min.