Final answer:
On average, about 178.5 liters of fluid are returned to the bloodstream every 24 hours.
Step-by-step explanation:
The average adult returns about 99% of the fluid that is filtered by the kidneys back into the bloodstream. This means that only about 1-2 liters of urine are produced per day. The kidneys regulate water levels in the body by adjusting the amount of water reabsorbed from the filtrate into the bloodstream.
For example, on average, the nephrons in the kidneys filter about 180 liters of fluid per day, but only about 1.5 liters are released as urine. The remaining 178.5 liters are reabsorbed back into the bloodstream. This process helps maintain the body's water balance.