Final answer:
The fluid flow rate exiting the proximal tubules should be equal to the Glomerular Filtration Rate, reflecting the amount of filtrate formed by the kidneys per minute and essential for maintaining bodily homeostasis.
Step-by-step explanation:
The fluid flow rate coming out of the proximal tubules should be equal compared to the Glomerular Filtration Rate (GFR). In the kidneys, the GFR represents the total amount of filtrate formed by all the renal corpuscles in each kidney per minute. It is a key indicator of kidney function. The fluid that enters the proximal tubules is essentially the same volume that has been filtered from the blood. Therefore, barring any abnormalities or disease conditions, the rate at which fluid flows out of the proximal tubules should match the GFR to maintain homeostasis within the body.