Display the Digestive System transparency and discuss the different parts of the digestive system (Give each student their own copy of digestive system).
Explain to students that they will be making models of their own digestive systems by measuring and cutting yarn to represent the lengths of different parts of the system, and then knotting the pieces of yarn together to form one long string.
Distribute student record sheets and materials. Read instructions together as a class. Highlight the transparency to demonstrate where students will be measuring. Use colours which correspond to the yarn.
Group students into pairs. Have them take turns measuring each other, so that each student has a set of data for his or her own body. (Measuring in centimetres and recording this data on Observation/Record Sheet) Have them cut lengths of yarn which correspond to the digestive organ they are measuring and assemble them (knot them) all together in proper order.
Black Yarn = Mouth
Light Blue Yarn = Esophagus
Pink Yarn = Stomach
Green Yarn = Small Intestine
Navy Blue Yarn = Large Intestine
Have students answer and complete "Conclusion" section of record sheet.
Once completed, students will have a model of their digestive system. We can review record sheets and discuss the "Conclusion" section.
Clean Up Time. Have students hand in record sheets and their digestive system model (masking tape attached to it with their name) for marking purposes.