The pathophysiology instructor will emphasize that the cells of the proximal tubule have a fine, villous structure that increases surface area, allowing for which physiologic function to occur with fluids?

The pathophysiology instructor will emphasize that the cells of the proximal tubule have a fine, villous structure that increases surface area, allowing for active transport processes to occur with fluids.

Explanation:

The proximal tubule is a part of the nephron and it controls the "pH of the filtrate" by exchanging "hydrogen ions for bicarbonates". It also secretes organic acids like creatinine and bases to be mixed with the filtrate, so that it is neutralized. Thus it helps in  the transportation of the filtrate and is also responsible for absorption and re-absorption of the fluids.