can reabsorb up to about 30 mg/min of glucose

expresses transport systems for both secretion and reabsorpiton of small organic acids and bases

can secrete protons, in exchange for Na+, to lower the pH down to 5.5 in the lumen

is the main determinant of the amount of urine that is produced

is involved in regulating sodium reabsorption

is the location where most of Na+ is reabsorbed

can reabsorb up to about 4 mg/min of glucose

is the site of bicarbonate synthesis by the kidney to restore the alkaline reserve

actively reabsorbs aminoacids, glucose, phosphate and bicarbonate

constitutes the primary factor in determining how much Na is eliminated