In the extracellular region near the plasma membrane, portions of membrane-associated molecules wait to capture<unk>  and transport it into the cell. The<unk>  may occur as inorganic orthophosphate particles or be part of an organic molecule (organophosphate). Bringing<unk>  in any form into the cell and when needed transporting<unk>  out of the cell is a necessary activity of<unk>  for that cell.
Phosphate homeostasis
Acid-base homeostasis
Fatty acid metabolism
Lipogenesis
Chiral pool synthesis
Renal urea handling
Ammonia production
Cellular respiration