Sections View Full Chapter Figures Tables Videos Annotate Full Chapter Figures Tables Videos Supplementary Content + Download Section PDF Listen ++Table Graphic Jump LocationTable A–1.Summary of major reabsorption and secretion events by major tubular segmentsView Table||Download (.pdf) Table A–1. Summary of major reabsorption and secretion events by major tubular segments Proximal tubule Loop of Henle Distal tubule Collecting ducts Organic nutrients R Urea R S R Proteins, peptides R Phosphate R Sulfate R Organic anions* S Organic cations* S Urate R (mostly) and S Sodium R R R R Chloride R R R R Potassium R R S (usually) and R Water R R R Hydrogen ions S S S or R Bicarbonate R R S or R Ammonium S R S Calcium R R R * Some passive transport may occur in the distal nephron depending on pH. ++Table Graphic Jump LocationTable A–2Major functions of the various collecting-duct cellsView Table||Download (.pdf) Table A–2 Major functions of the various collecting-duct cells Principal cells Reabsorb sodium Secrete potassium Reabsorb water Type A intercalated cells Secrete hydrogen ions Reabsorb potassium Type B intercalated cells Secrete bicarbonate Inner medullary cells Reabsorb urea Secrete ammonia/ammonium