CCD
IMCD
H Fig. 44-1 Segmenta! reabsorption of HC03“. The fraction of the fiitered load of HC03~ reabsorbed by the various seg-ments of the nephron is shown. Normalły, the entire fiitered load of HC03~ is reabsorbed. PT, Proximal tubule; TAL, thick ascending limb; DT, distał tubule; CCD, collecting duet; IMCD, inner medullary collecting duet.