Students study digestion by observing what happens to a starch when it is combined with a chemical that models saliva. Students observe that iodine can pass through a membrane but starch cannot. They observe digestion of proteins, using meat tenderizer as an enzyme source. Students also model the absorption rate of villi in the small intestine.

Student Resources

Learn by Reading

For additional content-area reading, check out the Houghton Mifflin Science eBook: Grade 5, Unit A, page 36.