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Model Intestine

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A series of free Science Lessons for 7th Grade and 8th Grade, KS3 and Checkpoint Science in preparation for GCSE and IGCSE Science.

Testing a Model Intestine
This is an experiment used to model the digestive system. We use a Visking tubing to model the digestive system and show what substances can pass through its lining. The Visking tubing is semi-permeable: it allows smaller molecules like water and glucose to pass through its microscopic holes but larger molecules like starch cannot pass through it.
1. Soak the Visking tubing in water to make it flexible.
2. Add a mixture of starch and sugar solution into the Visking tubing which will model the intestine (gut).
3. Put the tubing in a beaker of warm water.
4. Sample the liquids inside and outside the tubing. Test the samples for starch and glucose.
5. After 15 minutes, sample the liquids inside and outside the tubing again. Test the samples for starch and glucose.
6. Record the results.
7. What is your conclusion?

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