1. Energy and Living Systems

2. Energy You get energy from the food you eat. You get energy from the food you eat. Where did that energy come from? Where did that energy come from? Let’s take a look at what you eat. Let’s take a look at what you eat.

3. Food Origins Big Mac Big Mac

4. Food Origins Big Mac Big Mac Meat Meat

5. Food Origins Big Mac Big Mac Meat Meat Cows eat grass.

6. Food Origins Big Mac Big Mac Meat Meat Cheese Cheese Cows eat grass.

7. Food Origins Big Mac Big Mac Meat Meat Cheese Cheese Cows eat grass. Dairy from cows (grass).

8. Food Origins Big Mac Big Mac Meat Meat Cheese Cheese Bread Bread Cows eat grass. Dairy from cows (grass).

9. Food Origins Big Mac Big Mac Meat Meat Cheese Cheese Bread Bread Cows eat grass. Dairy from cows (grass). Flour (wheat) and dairy

10. Food Origins Big Mac Big Mac Meat Meat Cheese Cheese Bread Bread Pickles Pickles Cows eat grass. Dairy from cows (grass). Flour (wheat) and dairy

11. Food Origins Big Mac Big Mac Meat Meat Cheese Cheese Bread Bread Pickles Pickles Cows eat grass. Dairy from cows (grass). Flour (wheat) and dairy Pickles (plant)

12. Food Origins Big Mac Big Mac Meat Meat Cheese Cheese Bread Bread Pickles Pickles Cows eat grass. Dairy from cows (grass). Flour (wheat) and dairy Pickles (plant) Our energy comes from plants! Our energy comes from plants!

13. Food Origins Big Mac Big Mac Meat Meat Cheese Cheese Bread Bread Pickles Pickles Cows eat grass. Dairy from cows (grass). Flour (wheat) and dairy Pickles (plant) Our energy comes from plants! Our energy comes from plants! All energy comes from the sun!! All energy comes from the sun!!

14. Energy in Living Systems

15. Photosynthesis Photosynthesis: light energy is converted to chemical energy. Photosynthesis: light energy is converted to chemical energy. Organisms that use sunlight to make energy are called autotrophs. Organisms that use sunlight to make energy are called autotrophs.

16. Photosynthesis

17. Digestion Stored chemical energy can be transferred to some organisms. Stored chemical energy can be transferred to some organisms. Heterotrophs use the stored energy by breaking apart the large molecules during digestion. Heterotrophs use the stored energy by breaking apart the large molecules during digestion. Creates glucose and other molecules. Creates glucose and other molecules.

18. Digestion

19. Enzymes Special proteins that make reactions happen faster and with less energy. Special proteins that make reactions happen faster and with less energy. Can speed up a reaction up to a million times! Can speed up a reaction up to a million times! Ex: CO 2 + water = carbonic acid Ex: CO 2 + water = carbonic acid 200 reactions/hour w/o enzyme. 200 reactions/hour w/o enzyme. 60,000 reactions/sec w/enzyme. 60,000 reactions/sec w/enzyme. A 10,000,000 times increase! A 10,000,000 times increase!

20. Cellular Respiration Cells make carbon in glucose into stable carbon dioxide molecules and produce energy Cells make carbon in glucose into stable carbon dioxide molecules and produce energy