1. Environmental Literacy Project Michigan State University Animals Lesson 4.2 Cow Digestion and Biosynthesis 1

2. Organic molecules LARGE = Polymer 2 SMALL = Monomers STARCH GLUCOSE (SUGAR)

3. Place large food molecules (grass) here Food molecules are in the grass 3

4. Place food molecules in stomach When food is eaten it moves to the stomach 4

5. Breakdown Food Molecules (Digestion) Let’s focus on what happens to PROTEIN in food. (Put the other food molecules to the side of the poster for now.) Digest PROTEIN molecules by breaking the protein into individual amino acids. 5 Chemical change

6. Breakdown Food Molecules (Digestion) Digest STARCH molecules by breaking the starch into individual glucose monomers. 6 Chemical change

7. Breakdown Food Molecules (Digestion) Digest FAT molecules by breaking the fat into individual fatty acid and glycerol monomers. 7 Chemical change

8. Breakdown Food Molecules (Digestion) Digest FIBER molecules by breaking the cellulose into individual glucose monomers. (Microorganims in stomach break down) 8 Chemical change

9. Digestion occurs in stomach and small intestines Break apart large food molecules into small molecules here in intestines 9

10. Small molecules move through circulatory system Small molecules move from intestines to arteries, and the heart pumps blood and small molecules to all parts of the body. 10

11. Digested Monomers: where do they go? glucose glycerol amino acid fatty acid 11

12. Build large molecules in muscle here Biosynthesis is the process of small organic molecules becoming large organic molecules in all body parts 12

13. What’s in cow muscles (BEEF)? PROTEIN FAT 13

14. Build Cow Muscles (Biosynthesis) Build PROTEIN molecules by linking 5 amino acid monomers. 14 Chemical change

15. Build Cow Muscles (Biosynthesis) Build FAT molecules by linking 3 fatty acid monomers to 1 glycerol molecule. 15 Chemical change

16. What happens to food monomers that are not used in biosynthesis? 16

17. Waste molecules outside of the cow (carbohydrates in feces and urine) …carbon dioxide from the breath now outside the cow waste molecules in lung (carbon dioxide) and then… 17