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3. The Human Body & Digestion / Organs of the Gastrointestinal Tract / Problem 15
Problem 15
Estimate the overall fold increase in intestinal surface area if the internal circular folds of the small intestine increase area by 3-fold, the villi add a further 8-fold increase, and the microvilli (brush border) multiply the remaining surface by 20-fold. Show full calculations and give the final multiplicative increase.