The lining of the Small Intestine is folded into thousands of tiny finger like projections, called Villi
These greatly increase the uptake of digested food molecules by diffusion, as only a certain number of food molecules can diffuse over a given surface area of gut lining at any one time
Like the lungs, the lining of the Small Intestine has a great bloody supply, which can carry away all the digested food molecules to the rest of the body, as soon as it has diffused across. This maintains a Steep Concentration Gradient at all times.
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