Water is absorbed in the intestine mainly by osmosis through simple diffusion driven by osmotic gradients created by solute (especially sodium) transport.

Quick Scoop

  • In both small and large intestine, water moves passively from the lumen into the blood along osmotic gradients created by active absorption of electrolytes like sodium and chloride.
  • This passive movement of water across the intestinal epithelium is essentially an osmotic form of simple diffusion through the membrane and via water channels (aquaporins).

So, if this is an MCQ with options such as:
a. Facilitated transport
b. Simple diffusion
c. Active transport
d. Endocytosis the best answer is: Simple diffusion (osmosis).

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