Absorption of water in the small intestine

Water transport in the gastrointestinal tract is largely a function of the small intestine. It is an example of passive diffusion across the wall of the small intestine. The stomach is almost impermeable to water but the small intestine is highly permeable; therefore the transport of water in the small intestine can occur both from the lumen to the blood, or from the blood to the lumen. Net transport of water is achieved by the osmotic gradient and it will occur in whatever direction the osmotic forces dictate. Water will be secreted into the lumen if the chyme is hypertonic to the plasma, and absorbed into the blood if it is hypotonic. The chyme entering the duodenum from the pylorus of the stomach is normally hypertonic in nature.

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