Final answer:
The statement is false; a low GFR leads to slower filtration, allowing more time for reabsorption, although it can result in insufficient waste clearance.
Step-by-step explanation:
Glomerular filtration rate (GFR) is a test used to check how well the kidneys are working. Specifically, it estimates how much blood passes through the glomeruli each minute. Glomeruli are the tiny filters in the kidneys that filter waste from the blood.
The statement that if the glomerular filtration rate (GFR) is too low, needed substances may pass so quickly through the renal tubules that they are not absorbed and instead are lost in the urine is false.
A low GFR means that filtration by the kidneys is occurring at a slower rate, which gives the tubules more time to reabsorb needed substances.
However, if the GFR is too low, it can lead to inadequate clearance of waste products from the blood, which could be harmful.