Absorption of Water
Isosmotic
Absorption. Water is transported through theintestinal membrane entirely by diffusion. Further-more, this diffusion
obeys the usual laws of osmosis. Therefore, when the chyme is dilute enough,
water is absorbed through the intestinal mucosa into the blood of the villi
almost entirely by osmosis.
Conversely, water can also be transported in the opposite
direction—from plasma into the chyme. This occurs especially when hyperosmotic
solutions are dis-charged from the stomach into the duodenum. Within minutes,
sufficient water usually will be transferred by osmosis to make the chyme
isosmotic with the plasma.
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