text: <unk>  is the part of renal physiology that deals with the retrieval of filtered<unk> s, preventing them from disappearing from the body through the urine.
  Almost all<unk>  takes place in the proximal tubule. Only ~1% is left in the final urine.
  The<unk> s cross the apical membrane by endocytosis. They are subsequently degraded in lysosomes. The remaining free amino acids are transported across the basolateral membrane by amino acid transporters.
option_0: Renal protein reabsorption
option_1: Renal urea handling
option_2: Renal oligopeptide reabsorption
option_3: Renal glucose reabsorption
option_4: Renal chloride reabsorption
option_5: Renal blood flow
option_6: Microcirculation
option_7: Renin-angiotensin system