Final answer:
Active transport does take place during the kidney filtration process, specifically in the reabsorption phase, where substances like glucose are moved against their concentration gradient using cellular energy.
Step-by-step explanation:
The process of kidney filtration involves a combination of passive and active transport mechanisms. Active transport is a process by which substances are moved across a cell membrane against their concentration gradient with the use of energy in the form of ATP. An example of this in the kidneys is the sodium-potassium pump, which utilizes active transport to move sodium ions out of cells and potassium ions into cells. Conversely, during dialysis, which is an artificial kidney filtration process, harmful substances like urea are removed from the blood primarily by creating osmotic gradients or facilitated diffusion, rather than by active transport.
In the specific context of glucose reabsorption, secondary active transport is utilized in the kidneys. This occurs via a Na+/glucose symport protein, which allows glucose to move into the cell against its concentration gradient while sodium moves down its gradient established by Na+/K+ ATPases. This mechanism exemplifies the active transport efforts within the kidneys during the reabsorption phase of filtration. Therefore, active transport indeed occurs during the kidney filtration process, particularly in the reabsorption of certain solutes.