* The proximal tubule is a major site for reabsorption and some secretion.
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* The [[Microscopic Anatomy of the Nephron - Anatomy & Physiology#Proximal Tubule|proximal tubule]] is a major site for reabsorption and some secretion.
* Gradients are small across the epithelium so tight regulation is not possible
* Gradients are small across the epithelium so tight regulation is not possible
* This occurs in the [[Distal Tubule - Anatomy & Physiology | distal tubule]]
* This occurs in the [[Distal Tubule - Anatomy & Physiology | distal tubule]]