Explain how diffusion allows the small intestine to absorb soluble molecules but not insoluble ones.
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The villi in the small intestine provide a large surface area with an extensive network of blood capillaries. This makes the villi well adapted to absorb the products of digestion by diffusion and active transport. ... the villi are made of a single layer of thin cells (one cell thick) so there is a short diffusion path 3.
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Diffusion is the method through which digested food passes into the blood vessels from the wall of the intestine. The food is carried from the intestine into these vessels through the villi.
The absorbed food passes through the blood vessels and carries proteins that are required for the body's growth. The food that is not digested passes into the large intestine.
The villi are present in the small intestine have a large surface area with blood vessels. Villi absorb the food during digestion by diffusion and actively carry it to different parts of the body.
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