FA 2019 P 573 - The only part of the nephron that first aid says has an effect on PO4 3- is PCT.
Early PCT—contains brush border. Reabsorbs all glucose
and amino acids and most HCO 3 – , Na + , Cl – , PO 4 3– , K + ,
H 2 O, and uric acid. Isotonic absorption. Generates and
secretes NH 3 , which enables the kidney to secrete more
H + .
PTH—inhibits Na + /PO 4 3– cotransport = Increased PO 4 3– excretion