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because they function as size-selective molecular filters. Thus, the filtrate that
enters the capsular (urinary) space in the renal corpuscle is not urine. Instead, it
is an ultrafiltrate that is similar to plasma, except for the absence of proteins.
RENAL TUBULES
The glomerular ultrafiltrate that leaves the renal corpuscle first enters the renal
tubule, which extends from the glomerular capsule to the collecting tubule. This
renal tubule has several distinct histologic and functional regions (Fig. 18.2).
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