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** Lots of mitochondria to provide energy for exchange
 
** Lots of mitochondria to provide energy for exchange
 
** Lots of Na<sup>+</sup> / K<sup>+</sup> ATPases to maintain ion levels in cells at right level to allow efficient take up of ions from lumen
 
** Lots of Na<sup>+</sup> / K<sup>+</sup> ATPases to maintain ion levels in cells at right level to allow efficient take up of ions from lumen
 +
 +
===The Physiology of the Proximal Tubule===
    
==The Loop of Henle==
 
==The Loop of Henle==
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