- Through questioning, elicit pupils' ideas about digestive enzymes as a means of breaking down larger molecules. Establish that the water outside the tubing in the model represents the blood system. Ask them to explain the process,
eg using animations from CD-ROMs or video, or interlocking bead models of large molecules. Ask pupils to draw a sequence of diagrams and then write an explanation in their own words.
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- state that food is digested by enzymes in the gut to form smaller molecules and that these pass into the blood
- describe the processes involved,
eg by drawing diagrams, by using models, in writing
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