Which factor primarily drives osmotic water movement across the intestinal mucosa?

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Osmotic water movement is driven by differences in solute concentration across the intestinal mucosa. As solutes are actively transported or absorbed, the osmolarity on one side becomes higher, pulling water toward that side to balance concentrations. Water can move through the epithelium via transcellular or paracellular routes to follow this gradient, often via aquaporin pathways. Temperature differences and electrical potential differences don’t set the osmotic pull, and hydrostatic pressure mainly affects bulk fluid movement rather than the osmotic driving force. So the key driver is the solute concentration difference—the osmotic gradient.