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|linkpage =Urinary System - Anatomy & Physiology
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|tablelink = Urinary System (Table) - Anatomy & Physiology
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|sublink1=Transport Across Membranes - Physiology
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|subtext1=TRANSPORT ACROSS MEMBRANES
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==Introduction==
 
==Introduction==
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The region of hydrophobic molecules means that it is only lipid soluble molecules which are able to cross the membrane.  Polar molecules and ions struggle to cross the membrane without some kind of help.  Hence the need for [[Transport Proteins - Physiology#Diffusion Through Water Filled Protein Channels|water filled protein ion channels]].
 
The region of hydrophobic molecules means that it is only lipid soluble molecules which are able to cross the membrane.  Polar molecules and ions struggle to cross the membrane without some kind of help.  Hence the need for [[Transport Proteins - Physiology#Diffusion Through Water Filled Protein Channels|water filled protein ion channels]].
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[[Category:Transport Across Membranes]]
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