All IntestinaIWaterAbsorption Is Passive, Occurring Because of the Absorption of OsmoticaIIyActive Solutes
Water moves through the intestinal mucosa by either the paracellular or the Iranscellular route, but always by osmosis. The general discussion of osmosis in Chapter 1 should be reviewed by those who do not have a clear understanding of the process.
The intestinal mucosa is freely permeable to water, allowing it to move in whatever direction is dictated by changes in osmotic pressure. As electrolytes and other soluble nutrients are actively absorbed, water is drawn along passivelyTable 30-2
Distributions of Electrolyte Absorptive IviechanismsThroughout the Gut
from lumen to intestinal capillaries. Water may move also into the intestinal lumen at times when the intraluminal osmotic pressure is high, as discussed later.
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