Processing of filtrate in the proximal and distal tubules A) ...

[j_sun]

Processing of filtrate in the proximal and distal tubules
A) achieves the sorting of plasma proteins according to size.
B) achieves the conversion of toxic ammonia to less toxic urea.
C) maintains homeostasis of pH in body fluids.
D) regulates the speed of blood flow through the nephrons.
E) reabsorbs urea to maintain osmotic balance.

[sammy]

I remember it was C

[j_sun]

Thanks dude! Marking this solved.