Ammonia is extremely toxic to cells - proteus

[ArchivalUser]

Ammonia is extremely toxic to cells and is kept at very low concentrations by the body. The urea cycle converts ammonia to urea which is nontoxic. Urea contributes to which of the following?
A. Serum osmolality and serum osmotic pressure
B. Serum osmolality but not serum osmotic pressure
C. Serum osmotic pressure but not serum osmolality
D. Neither serum osmotic pressure nor serum osmolality