* Contrary to popular belief diffusion of water accross lipid bilayers is too slow for most physiological processes
* Contrary to popular belief diffusion of water accross lipid bilayers is too slow for most physiological processes
* Aquaporins solve this problem
* Aquaporins solve this problem
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==Other Means of Water Homeostatis==
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As well as the aquaporins in the distal tubule and collecting duct significant water reabsorption occurs in the [[Proximal Tubule - Anatomy & Physiology| proximal tubule]] and the [[Loop Of Henle - Anatomy & Physiology| Loop of Henle]] and is linked to the absorption of [[Sodium Homeostasis - Physiology| sodium.]]