B3 1.7: Exchange in the Gut. 0.0 / 5 ? BiologyExchange of materialsGCSEAQA Created by: JSpencerCreated on: 03-03-16 19:12 What happens to the food we eat in the gut? It is digested into small soluble molecules. 1 of 7 What happens to them in the small intestine? Solutes are absorbed back into the gut. 2 of 7 Where are the villi? The line the inner surface of the small intestine. 3 of 7 What do the villi do? They are the exchange surface for food molecules. 4 of 7 Why do the villi help? The greatly increase the surface area for absorbation to take place. 5 of 7 What are the walls of the villi like? Very thin and there are many cappilaries close to the wall. 6 of 7 What happens to the soluble products of digestion? The can be absorbed into villi by either diffusion or active transport. 7 of 7
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