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Here are proper conditions for osmosis, and this process of dialysis will take place whenever the intestinal contents holds more dialyzable material than the blood.
"Thus any substance, any poison that is dialyzable is diffused into the surrounding salt solution and the blood is passed back into the body, with no air in it, no infection, and without alteration. Clotting is prevented by the injection of a harmless substance derived from leeches, known as hirudin.
In the first place, most of the food when swallowed is not soluble, and therefore not capable of osmosis. But the process of digestion, as we have seen, changes the chemical nature of the food. The food, as the result of chemical change, has become soluble, and after being dissolved it is dialyzable i.e., capable of osmosis.
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