To provide a model of the inside of the small intestine for students who are blind or visually impaired to examine and to support their understanding of the function of villi in digestion
The structure of the small intestine is designed for absorption of nutrients. The inside of the small intestine is lined with villi that absorb nutrients from the liquid mixture called chyme produced in the stomach from the food we eat. Biology books usually have a detailed picture of the villi. Some plastic science models also show villi. However, this easy to create model more accurately presents the concept of villi in a way that can be accessed tactually and visually. Blood vessels on the outside of the intestinal wall absorb nutrients so that they can travel around the body in the blood.
Use a bath mat made of chenille or other material with loops, cover the outside of the rug (non-looped side) with mesh (preferably red) left over from a bag of onions from the grocery store or other source. The mesh will replicate the blood vessels. Roll the rug into a tube with the loops on the inside. Fasten the rug with Velcro or hook and eye closures.
LS1.A: Structure and Function
Multicellular organisms have a hierarchical structural organization, in which any one system is made up of numerous parts and is itself a component of the next level. (HS-LS1-2)
Hughes, Sarah, Head of Science. Making Models: New College Worcester, United Kingdom, 2009.
Miller, Kenneth R. PhD. And Joseph s. Levine, Biology: Foundation Edition: Pearson Education, Inc., 2010.
This activity was authored by Sarah Hughes, Head of Science, New College Worcester, United Kingdom.
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