PCT reabsorption: H2O, electrolytes, glucose, amino acids, urea, creatinine, bicarb, phosphate, Cl-, K+, Mg2+, low MW proteins
DCT/CT: reabsorb/secrete K+, secrete H+, NH4+, uric acid
aldosterone response: Na+ reabsorb (HCO3-/Cl- follow)/K+ secretion
vasopressin: water (Na+) retention
GFR (serum creatinine/clearance)
Influenced by renal perfusion pressure, renal vascular resistance, glomerular damage, post-glomerular resistance
GFR changes linearly in proportion to renal mass loss